Nova Seized!

I was wondering if someone could please help me! I have a vauxhall nova and just got it back 2 days ago after paying £350 for work on it. Well... yesterday i was driving when i noticed the oil light come on so i went to pull in, but before i could the car stalled and would not start again. I take it the engine has seized, i have now put oil in the care but was wondering if anyone had any ideas on how to unseize the car. Any ideas would be great thanks :grinyes:

Have it towed back to however repaired the car. Sounds like they did not check the oil level or left the oil filter loose or something...

Will need an engine rebuild if it has seized