Still billed for cancelled contract

I cancelled my data contract which was up for renewal with Khozani on 02 January 2018 and asked for it to be converted to prepaid. After noticing charges still being debited to my account I called and spoke to Nomtandazo on 09 March 2018 who confirmed that my request to cancel my contract and covert to prepaid was logged and never actioned and that she was going to escalate the matter and have the incorrect charges be reversed. Upon checking MyVodacom today, I am still being billed for the data contract and no reversals have been done. This is exceptionally poor service and there is no reason provided for the delay. The reference for the query escalation is 1- ********** ********** .