CALL CENTRE AGENTS FROM CELLC LIE - STILL GETTING DEBITED AFTER THE END OF MY CONTRACT - I HAVE NO MONEY ITS SO UNNECESSARY

CellC has a clause that says you must call 1 month before your contract ends of you wish to continue which I did. But even with the calls i made about 3, i sent an email stating that i wish to cancel contract once the money i owe was paid. When i called they said i must pay first and i did but it seem their call centre people do not close your contract on call they act as if all is sorted but to my surprise i was debited this morning for data. When i did state they must close the contract as i do not have access to the number anymore. Where to we get help from such big companies?. I have call references and an email which was sent. CellC you must remember we will always remember how diff your consultants make it for us when we want to leave contracts. Right now i am being debit money that i dont have even after i followed the correct procedure of notifying my exit. Please assist urgently if your customer services still exist.