Unfair blacklisting by mtn

<p>I had a contract with mnt, and I payed for 2 years. After 2 year they still deducted my money. I visited the store about the issue, they told me that I have to cancell the contract, if I don't want to upgrade. I told them to cancell it, BT they gave me a number to call and cancell. I called the no and cancelled, to my surprise they still deducted. I called again to inquire. They said if I cancell I have to pay them for extra 2 months which I did. BT after those extra 2 months they still deducted. I got tired and reversed those deductions. I then received a letter that I owe mntn. I did not respond to that letter, and recently their lawyers called to say I will be blacklisted.</p>