MTN - THE MOST USELESS SERVICE PROVIDER EVER

MTN HAS BEEN CHARGING ME FOR A CONTRACT THAT HAS EXPIRED AT THE END OF JAN'15. I HAVE CALLED THE CALL CENTRE TO CANCEL THIS CONTRACT IN THE MIDDLE OF FED BUT WHEN RECEIVING MY STATEMENT AT THE END OF THE MONTH, THIS CONTRACT WAS STILL CHARGED TO MY ACCOUNT. I HAVE SEND THEN SO MANY FOR LIKE FOR MONTHS BUT UNTIL TODAY I HAVE NOT RECEIVE ANY RESPONSE. WHEN I CALL THE CALL CENTRE, I HAD TO WAIT FOR ABOUT AN HOUR AND STILL NO ANSWER SO I HAD TO END THE CALL. EVERYTIME I CALL THE CALL CENTRE I HAVE TO WAIT HOUR AND HANG UP. I HAVE 4 CONTRACTS WITH MTN WHICH I WILL TERMINATE AS I PREFER USING VODACOM OR CELL C AS THERE SERVICE IS WAY BETTER THAN MTN....