Beware Taking a Out a Contract with MTN

I have been trying for months to cancel my business contract with MTN and they continue to bill me. I have been in to their store, written emails with my business letterhead, and done everything requested to get my contract cancelled. I have sent my emails to *** as requested and then resent them on two separate occasions and I don't even get the courtesy of a response. I believe that this company is acting in a highly ********* manner and I advise anyone wanting to take out a contract with them to be very careful as it would appear that when you want to cancel your contract they simply ignore your requests.