Sony India — regarding the service

Our television was facing a problem in november last year so we called up at the service center although they took the television and repaired it in a few days the problem was still not solved. Today its 11th august 2017 and our tv has been taken thrice by those service center people because the problem keeps on occurring again and again they take the tv, keep it for 3-4 days and return it saying its fine now and this keeps on repeating after every few months. I would like to request the company to look forward on this issue otherwise exchange the tv.