repair claim

I have been trying thru my mechanic for over two weeks to get the
authorization he needs to repair my truck.  I am wondering just how long
this is suppose to take.  I had a phone # but seems I can never get a real
person on the phone - just recordings
Name: Sherman Trail
Product: GreatChoice
Agreement: FD4356007
Vehicle: 2006 Chevy K2500 Siverad
Seller:  Motor Vehicle Solutions