Hyundai unsatisfied customer

I've taken my Atos1.1 motion to Hyundai Richards Bay for its first service. The vehicle had some defaults which needed to be attended too besides the service.. These defaults were not attended too but the service advisor said to me if I have a problem I must bring it back. Well I did experience one of the defaults.. I was contacting the service advise but his number on business card is going onto voicemail and the land line is keep on going onto a recording. I even contacted the customer care number and I told them my problem and the consultant said to me she will get back which never happened. Beside the default on the vehicle, the first service requires all filters and oils to be changes beside the general top ups and checks. I checked the air filter on vehicle and found it unchanged.. This is making my vehicle heavy on fuel. Hyundai Richards Bay, I'm not a satisfied customer.