Does this need to be on an auto forum. It's more a matter of conscience. You seem to feel like you've done something wrong. As stated call the service manager and ask. You'll feel better.
I once bought an E-250 van that had solid windows all around. I wanted hinged windows. I struck a deal to have them replaced. I took the van home, they ordered the parts. The parts dragged in causing delays. They had to order new glass, hinges, hardware, latches and gaskets for each window. Many parts were different. So after 3 weeks it was complete. They couldn't find the invoice for the work. Finally the general manager of the dealership came up to me with the invoice. He apologized for the delay and tore the invoice up saying I owed them nothing.
I definitely referred them to everybody. Honesty is the best policy.