Bad service from Lintech TV repairs

Very disappointed... They came to fix my TV and it only worked for +-2 weeks (during this period, I only used it 3 times for less than +-4 hours). They came again to fix the TV, replaced power supply which was working perfectly fine and replaced backlights with non original parts.... after this TV only worked for an hour... I contacted them to come and fix the TV and they refused to come back and asked for my banking details to refund me... it's been 2 months now and I've not been refunded and they no longer answering any of my calls and messages...