LG 42' TV

I bought a LG 42\ TV from OK Furniture and purchased an extended warranty with it. The TV screen started flashing between bright and dim and as it is still under warranty I took it back to the store i purchased it from. I was promptly informed that because it was under extended warranty it would not receive priority and the technician would do the work when he had a chance. After 2 weeks of no feedback I called in and was told that the lady (Charade) who dealt with the matter was on leave and they cant (or wont) help until she is back. After 4 WEEKS and putting up a fuss I was told to collect the TV. The report stated that there was nothing wrong with the TV and that I should check the cables i use on the TV ( IF THERE WAS NOTHING WRONG WITH THE TV WHY TAKE 4 WEEKS TO STATE THAT ) I tested different cables and devices