Game the glen, do not want to repair my TV...

My name is Lizzie Aphane, I bought JVC TV in May 2014 and paid for extended warranty so now my TV is broken and they don't want to repair my TV because the sales man made a mistake instead of written May 2015 he wrote May 2016. I spoke to Regim from Game The Glen and she said there is nothing they can do, if they repair it then I must pay for it while I paid for extended warranty... I called the head office and spoke to Joleen and she said The glen store manager Castor must sort it out because its their mistake not my mistake, but Castor didn't wanna to talk to me, he referred the matter to the floor manager by the name of Kelebogile but still the lady said there is nothing she can do to assists me. Till this day my TV its not repaired and still at their store. Can you please assist me with this matter...