ABSA warranty,

I have a ABSA car warranty with innovation group, I recieved authorisation to take the car in for repairs , now that it is repaired no payment has been paid to the mechanic and they refuse to release my car

Why even give authorisation if you not going to pay the mechanic

Iv called innovation group 17 times and they tell me I need to call payment department but they don't know what the payment department number is

I thought ABSA would choose better partners to do business with , this is terrible service

How do I get my car back !!!!!