Almost 9 months later and still no service

I had an accident on the 9/5/2014, and the vehicle was checked into Renew-it's workshop on the 30/5/2014. The repairs were carried out and the vehicle was returned to me, only for me to take it back to Renew-it the following week, as they had not repaired/replaced the drivers seat and it moves around whilst I am driving. Renew-it apologized and ensured that the part would be ordered and they would contact me once it arrived in order to replace it. It is now almost 9 months later and my car has still not been repaired. I have spoken to Tanya, Lyle and Abert, and i just keep getting given the run around. The excuse is that the seat has been ordered several times, but the wrong one keeps getting delivered (Left instead of the Right). I am totally disappointed in the service I have received and wonder whether my car will ever get repaired. I am in the process of taking this up with my insurer (Discovery), as I think it is utterly disgusting that they would recommend a panelbeater that not only gives their clients the run around, but can't tell their left from their right.