Worst stressful service

I wrote a review about vodacom a month ago about cancelling my contract.they got back to me and promised to cancel it.They never did,i tried calling them a few times and havent gotten assistance.My contracted ended and they still want to deduct.Now they decided to block my number instead of just putting it on prepaid.They flagged as a **** call because im calling them to try resolving the cancellation.How can i **** them if im trying to get help,meanwhile they are ****ming me by deducting for a contract that ended.Now im thiking of contacting the ombudsman if im not being taken seriously.Their service is poor and im warning people from using their services