Bad customer service

IN LAST COUPLE OF YEARS I GOT BOUT 150 SINOTEC FLATSCREEN TVS BUT LATELY A BATTLE TO GET GOOD SERVICE FROM CN TRONICS WHO ARE SERVICE AGENTS FOR SINOTEC IN PAST 5 MONTHS I HAD TO RETURN SAME SETS UP TO 3 TIMES. I HAD ONE SET IN AND OUT ONCE A MONTH AND LAST TIME IT WAS BOOKED IN I WAS TOLD COUPLE OF DAYS LATER THAT SET IS ON TEST SOAKING AFTER A WEEK THE PHONE ME TELLING ME THAT THE TV GOT QUOTE NOW FOR NEW SCREEN AS THE SCREEN ARE CRACKED NOW AFTER GOING TO AGENTS COUPLE OF TIMES I MUST NOW PROVE THAT SCREEN WAS NOT CRACKED OR PAY FOR NEW SCREEN THEY ARE NOT RESPONCEABLE FOR SCREEN DAMAGE,IS HIS A COMPANY THAT YOU TRUST WITH YOUR TV EVEN GOING IN FOR REPAIRS WHILE STILL UNDER WARANTY. AND I STILL HAD TO TAKE IT MYSELF FOR REPAIRS EVERY 2 MONTHS THINK TWICE BEFORE BYING A SINOTEC TV