Contract expired but you still debit

Last year November i advised tracker not to renew my contract and told that it will only end on the 13th of March 2016.<br> <br> your *********** agent kept on insisting that i inform them of my cancellation 30 days before, despite my efforts telling her to end date the contract on the system.<br> <br> on the 29th of February i reminded tracker not to renew my contract and the very same *********** agent tell me that my contract will only be cancelled 30 days after the reminder meaning that now i will have to pay for another full following month's subscription.<br> <br> i do not know why i was not debited pro rata amount in February since my contract was nearing its end on 13th of March. <br> <br> i was debited full amount again for April in March (which i reversed and now your collectors are blood harassing me), why the hell is that happening?<br> <br> i even asked Sheila to send me a letter confirming my cancellation on the 3rd of April but my request was ignored.<br> <br> I need answers and please have this mess of yours cleaned.