Heater Blower installation

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Heater problem 2000 Cadillac Deville V8 Front Wheel Drive Automatic 94000 miles To replace the heater blower motor module is it required to remove or loosen the dash board ? We had the heater blower motor module replaced and a burnt connector terminal was repaired by a mechanic. When the car was returned to us the top corners of dash board ( both sides ) next to the windows at the were not seated properly. The two ends at the corners were loose, buckled and not connected to the car. The mechanic stated that it was that way before he repaired the car. We disagreed but he staed that he did not tamper with the dash board to replace the blower motor module . Please advise