Shot service vodacom the worse

For 5 months we have been battling to cancel a vodacom account . We have numerous reference numbers . Sent numerous emails . My daughter has left the country Vodacom wouldn’t cancel it unless she did it her self to the point that she flew here in November and they said it was cancelled in December she went to Vodacom and called we have so many reference numbers and now we get a statement to pay for January. What is the issue with vodacom? Should we go to ombudsman. I’ve been paying for a contract for two years that was cancelled