Failing to diagnose EPC fault for 2 weeks now

I sent my Golf 7 1.2TSi for its 30000km service at Midbay VW in Richards Bay,KZN on the 25th February 2015. Drove to Gauteng on the 26th but was badly suprised when, as I approached Ermelo, it displayed EPC on the dash and turbo cut off. It was sorted in Ermello by a very helpfull service manager at their VW dealership, however I drove hardly 50kms and the same problem reoccured. Vehicle was towed to Secunda VW where it has been since up to now. <br> Problem is VWSA says it can not provide me a courtesy vehicle since I do not have a credit card. <br> I have never heard of such and myself and my wife are having to walk to work or use metered cabs. I raised my concern at the time it has taken them to resolve the fault and got the worst ever attitude from Johan-service advisor and from John the Service manager. I have owned 3 VWs but I am certain that this will be the LAST one after the poor service and no feedback and falilure to diagnose and effect repairs on my vehicle and no replacement vehicle. Thanks for nothing VWSA