Delayed and irresponsible

My husband fitted a radio and amp in our land rover discovery 3, unfortunately something went wrong and the car would not start thereafter. The car was put in a flatbed and taken to landyworx where we were told that the cost to repair was R20k and the warranty would not cover it. We gave them the go ahead to repair, we even paid already but the car took over a month to be repaired and there was always an excuse as to why it's not done as yet. Eventually we got our car back, but the amp was not in the car, everytime we called Ian gave a different excuse saying he hasn't had a chance to check camera footage. After a while he said that it is too far back to check. Our personal belongings (the amp) went missing and they refuse to take ownership, this is not acceptable. And it takes forever for them to get back to you. I am even questioning now if they have the correct diagnosis in the first place.