Blocked number active debit order

Vodacom has been deducting my account for 2 months after an expired contract and have blocked the one number I use for calls,the airtime they upload is used by who since they blocked the number. The debit order religiously goes off every month, December they even **** and said the debit order returned that time it never did. I was promised a call to date no one gas called they buzz my number that's it and one "smarty pants" said they sent an email which was not in my inbox todate. Vodacom is a **** !