What's going on with the bad service????

I had in accident early Jan this year.After the accident I experienced possible electrical problems on my car. I informed Barland (assesor) and the panel beater (Monument) that when my aircon is on my car either don't start and the brakes disappear. The car was taken to Mazda and the said nothings wrong. Mazda SA then came out and concluded that a fault persist. Ever-increasing I got my car back it's been a nightmare. I still don't have an Arial that got lost at the panel beater (they accepted it). I've been traveling in in between Mazda and monument panel beater constantly. Which is unacceptable. Mazda says that Barland said they must only check the brakes for an hour and Barland says they lying. I have every phone call saved on my phone. My car now has no drive power. I fear the faults that still persist may damage my car further and I'm fearing for my safety due to no brakes. I just want to put on record should I get in an accident due to no brakes I will sue Zurich on the highest level possible as im getting no assistance other than my broker. I also demand my excess backfor my time and petrol and numerous phonecalls to get this sorted. What happened to service?