Agent confirming cancellation but still debiting my account.

after calling Vodacom to cancel my contract the agent said instead of cancel he would reduce the contract which i accepted. The following day i called back to cancel instead of continue and the agent promised he would cancel. I have now been billed 2 months already and no cancellation. I have a recording where the agent confirms the contract would end 31 december yet Jan & feb i have been debited. This is unprofessional and ******** to be told something and not commit to it. very unhappy customer