Big Problems With 99 Ford Taurus Overheating Engine Blow

I have had my ford taurus for 3 years i was at first getting no heat and an antifreeze odor so i took it to ford they went and pressure tested it and put some powdered stop leak in it.. said the heater core was leaking and that should fix it for now. Well it did but then the next day my car started over heating while i was parked and stopped in drive. So i took it back to ford they said my heater core was restricting the coolant flow. So i changed it.. Same problem again took it back to ford they said my water pump was dead and 350.00 to replace that... they said its fixed.. next day same problem not fixed yet i guess? took it back they said my radiator was half hot half cold.. replaced that for 400.00 took it off the lot started chirping and squealing the whole way to work took it back to ford they said coolant got on the belts 2 days later over heating AGAIN?? took it back to ford said look i paid twice to have the same problem fixed well more like 3 times and its still doing the same thing over heating. they took it in for free and said there a little bit of air getting into the system they dont know where from so they evaced the system and said it should be ok to drive for now this was on a friday and they told me to call them on monday to bring it back in. ok left to work and it jumps like it has hydrolics twice and dead.. tried to start it cluncking thats all... open the hood and to my suprise a pair of vice grips on the bypass hose from the water pump clamped holding the hose closed.. i called ford bitched about it and they sent seasonall to tow it back and said they would call me.. no call 8 pm go to ford to find my car outside still dead from the battery (trying to start it) charge it up and CLUNK CLUNK it runs if i hold the gas down but the rod seems to be cracked the engine blown..... and coolant in my oil? MY QUESTION NOW if the bypass hose was clamped off by some moron that forgot his tool dangling from the center of my bypass hose is that what caused my engine to blow ? (putting into consideration i wasnt getting any heat from heater core and it might have been blocked again?) Can someone answer this for me and give me an idea of what to do?? or say to these morons?

I have had my ford taurus for 3 years i was at first getting no heat and an antifreeze odor so i took it to ford they went and pressure tested it and put some powdered stop leak in it.. said the heater core was leaking and that should fix it for now. Well it did but then the next day my car started over heating while i was parked and stopped in drive. So i took it back to ford they said my heater core was restricting the coolant flow. So i changed it.. Same problem again took it back to ford they said my water pump was dead and 350.00 to replace that... they said its fixed.. next day same problem not fixed yet i guess? took it back they said my radiator was half hot half cold.. replaced that for 400.00 took it off the lot started chirping and squealing the whole way to work took it back to ford they said coolant got on the belts 2 days later over heating AGAIN?? took it back to ford said look i paid twice to have the same problem fixed well more like 3 times and its still doing the same thing over heating. they took it in for free and said there a little bit of air getting into the system they dont know where from so they evaced the system and said it should be ok to drive for now this was on a friday and they told me to call them on monday to bring it back in. ok left to work and it jumps like it has hydrolics twice and dead.. tried to start it cluncking thats all... open the hood and to my suprise a pair of vice grips on the bypass hose from the water pump clamped holding the hose closed.. i called ford bitched about it and they sent seasonall to tow it back and said they would call me.. no call 8 pm go to ford to find my car outside still dead from the battery (trying to start it) charge it up and CLUNK CLUNK it runs if i hold the gas down but the rod seems to be cracked the engine blown..... and coolant in my oil? MY QUESTION NOW if the bypass hose was clamped off by some moron that forgot his tool dangling from the center of my bypass hose is that what caused my engine to blow ? (putting into consideration i wasnt getting any heat from heater core and it might have been blocked again?) Can someone answer this for me and give me an idea of what to do?? or say to these morons?
....I learned that when ever you take your car to a shop, always check under the hood to see if things are right. Once they forgot to tighten one of the clamps on air intake. (could have caused a check engine light to come on, by air sucking and getting bad reading on mass air flow sensor). Last oil change at wal-mart was a quart low. (bet anything the guy does that on purpose. if customer doesnt return about it he can swipe quarts of oil with out any coming up missing on inventory). Had a spark plug wire protector shield missing after a sensor was replaced. Gotta keep a sharp eye out for these screw ups, catch em before you leave the lot.