IT SEEMS TO BE A MISSION TO CANCEL A CELL C CONTRACT

I have made a settlement amount of one of my cell c contract numbers on the 15th of January 2018, I called in a few days later to check if they have received my payment and they said no, i paid via EFT using the banking details they provided me with at the cell c customer service. I have been calling the customer service since January but no one seems to be of help, I was asked to send proof of payment to: fax ********** 417 or E-mail ********** which i did and was told it will take up to 2working days i called after the turn around time i was given and was told no documents were received, i was then given this one : Proof of payment can be faxed to ********** 417 or emailed to ********** and was told it will update within hours, when i called to hours later was sent from pillar to post with no help from any of the consultants and some even dropped calls on me, i have been struggling to cancel this contract as i get different information from agents that work for the same company i just cant keep on begging them to cancel my contract were as i have made the payment what fustrates me more is they keep on debitting me.