they probably broke it, while moving it.
The heat will do funny things to the wires under the hood and, if you are not careful, you (they) may break something.
I just did a head job on my car, which is an '86 with the original wiring. The wiring has lost some elasticity in some places but, I did not break anything...
Something does not feel right. I would ask them to show you the part and an explanation, in writing, of how this happen.
An independant may solder the wiring...