Contract cancellation

Vodacom are full of ****. My contract is coming to the end at the end of this month and I wanted to downgrade to a pay as you go only to be told that due to a problem we had in 2013 and a bank error on a debit order their legal department will decide when the contract can be cancelled or downgraded <br> <br> Payment is up to date and we don't want to renew due to the way they do business and the contract has been running for more than 15 years so why should they be allowed to hold a gun to your head the way they do.<br> <br> This is not on!!!!!!