$1500 That's insane! When it comes to TSTT, you have to be very vigilant with you bills. They have a very high tendency to rob you. I had internet with them several years back and it stopped suddenly. I called customer service and for over two weeks they couldn't identify the problem, finally someone told me that I had been cut due to an outstanding bill of $650. Please note, I was paying $200 a month for internet and I had NO arrears. I went into TSTT to report it and they told me that I had been cut for more than two weeks, therefore I could no longer query the bill. My only option would be the pay the $650 and re connection fee. I told them to 'F' off and left. Recently, by force I had to get internet from them again and they did the exact same thing....within my second month of using their shitty service. Needless to say, I acted swiftly to ensure the same crap didn't happen again. My neighbor's phone line has been cut for months and he gets a bill every month showing calls that he made.
TSTT cannot be trusted! Query your bill! You can call 824-TSTT and give them your account info and tell them that you want to put your phone one way.....That's all you need to do!