1997 Buick Lesabre car alarm

Body & Fender guys installed inside driver's side door panel. Inside door assembly was rusted and driver's side door will not open. After installing the door assembly, the factory car alarm went off! The B & F guys disconnected the car battery to stop the car alarm & then reconnected it. The car would not start, no engine cranking sound, no nothing!

Prior to B & F installing the driver's side door assembly, when inserting the key in the ignition & turning the car on, no sound, no cranking except the radio & lights worked. After maybe 10-20 minutes, the car would start. This would happen maybe 2-3 times a week but would always start.