EXTREMELY POOR CUSTOMER SERVICE

I bought 2 television sets in December on promotion, earmarked for the bedroom. We put the one tv up a few weeks ago, and since we had to mount it on a wall, we removed the plug to get it through the trunket. The tv worked for 2 weeks and then the one side of the screen went black. The tv was returned to the store, who had to send it to the technical support, and I had a technician calling me a couple of days ago telling me that my warranty are no longer valid because we removed the plug and this is deemed as a modification. i am now stuck with a tv that incredible connection do not want to replace or fix!! After spending a few thousand rand purchasing these items, how can you justify this!!! i am sure thousands of people buy tv sets and mount it on a wall and the cable will not be long enough to do this, so they will have to remove a plug to extend the cable or like myself, get it through the trunket. Is this reasonable to cancel my warranty because I removed the plug - i would think not! I am extremely upset about this lack of accountability. This is not my 1st incident with incredible connection and it seems that customer service is certainly not a priority to them.