Bad Service and feedback because my car is old?

So My car was at Renew it for repairs. No feedback no updates from them to track progress. Eventually I fetched the car and the paint was still wet and that part was not buffed. I needed the car as we were going away for the weekend so I took it. Few after this I discovered an oil leak. So this was caused from the accident and was never repaired by them. So my car went back for this repair. After a week of silence I phoned and they said they did not have my car there. After I freaked they found it. SO I drove there and nothing has been done. Sergio promised me the car would have been fixed by Friday afternoon May 24. Today is May 25 and I have had no feedback from them as to collect my car etc. The Switchboard ladies are not helpful neither. The previous paintwork still needed a buff and Sergio was not even told about this. If I did not mention this it would not have been done. They sit around there trying to look professional but I am afraid they do not succeed as they have no clue of customer service. For them a broken telephone get more attention than the customer standing in front of them making an effort to drive there to follow up on repairs. I am beyond disappointment with this company. This is my car and it is all I have. I was just wondering is this because my car is only a KIA and not a Mercedes Benz as it seems that those expensive luxury cars get the benefit of the better service. I will not recommend this Panel beater repair center to anyone.