Extremely unhappy customer

I bought 2 TV's that was on promotion in Dec. We eventually mounted the ONE TV on the wall at the end January. In order to mount the unit, and get the cable through the trunket, we had to remove the plug (which I am sure thousands of customers do). The TV lasted 2 weeks and suddenly half the screen was blacked out! I returned the unit to the store where I bought it, and they had to send it away for feedback. They then came back a week later to tell me that my warranty no longer applies as we removed the plug, which is deemed as us modifying the unit. I have never had such nonsense in my life! So now, after spending a few thousand rand on 2 TV's, I have no recourse on the television sets. How on earth can this be justified! This is not the 1st time that I have experienced poor after sales service. Both the technician and the branch manager had no interest in resolving my problem and told me in no uncertain terms that it does not matter who I talk to, I won't get anywhere! I also called their customer services to complaint! NO WORD! Now surely this cannot be right! 1 thing for sure, I will never buy from incredible again! And I will be returning the 2nd unit still unopened. SHOCKING