Terrible experience with Vodacom

Worst company to take out a contract with...they sink their teeth into you and refused to cancel my contract when it was expiring ( I was a very long standing customer of theirs). They coerced me into another contract which I cancelled within the required 7 days and they just reverted back to my old expired contract which should have been cancelled. Then they started sending me emails of demand for money I didn't owe them as I had paid the final installment. They threatened to blacken my name and got me blacklisted. I would contact the CEO's office and the amounts would be credited and I would be told it was sorted out, but it would start all over again, and this continued for nearly a year until I finally got contacted by someone in vodacom who did sort it out once and for all. But now I am expected to pay to get my name cleared and off the blacklist which I refuse to do, as it was wrongly blacklisted by vodacom for money I did not owe. I find that reprehensible on their part and they should be the ones to remove my name from the blacklisting.