Worst customer service possible

My Hyundai Santa F? was sent in for it's 90 000 km service at the end of December 2014. I notified the service center in Groblersdal about a minor problem that I have identified on the power train of the vehicle. They advice me to bring back the vehicle in the New Year because all the engineering businesses where closed for the holidays. I took the vehicle back on the 15th of January 2015. Since then I am without a vehicle and either the service center in Groblersdal or the Hyundai Customer Care Center can give me a satisfied feedback on this matter. The case number the care center gave me is 11507. Since the 15th of January I am left without a vehicle struggling to get around. A courtesy car have been offered for one weekend and I had to return it the next Monday. No one can answer me or offer a solution while I have to wait. This type of service is utterly disappointing. There is absolutely no commitment or help for the customer by this company. I need to get my vehicle back so that I can sell it and buy a vehicle from a company that actually provides customer services.