EPC Light nightmare

I bought my Polo vivo in April 2013. I moved to JHB and had never used my aircon. After my first service I realised my aircon was not working as the temperatureres were peaking up in a new season. I reported this to the dealership (Strijdom Park), and they decided to regas. Since that day I started getting an epc light on my dash. In the middle of traffice the car would just lose power. VW strijdom park couldnt find the problem numerous times. I moved to Cape Town in 2014 and reported this same problem with my every service at Ferdi VW in Parow, they still couldnt find the problem. Then in 2015, I moved to Durban and took the car where I bought it, in Pine Street. On my third attempt to try and get this fixed, I spoke to the service manager who was very accomodating and sent my car for a diagnostics test. They found something was wrong with the wiring. I have been driving the car for four months without a problem, until just recently where my car just cuts off while driving. I don't want to book anymore interventions, because they dont find anything or they are just chasing numbers. Im thinking about selling this car and part ways with this brand completely.