Vodacom keeps debiting my money on a finishied contract

on the 3rd of january 2018 i called Viacom advising them i want to cancel my contract as it expired,the guy i spoke to said because they had given me the airtime ,they will debit only the 110,00 on the 1st of February not the expired amount of the contract,to my surprise the debit order still goes through with the full amount i had requested them to stop taking from my account . i am so ****ed really,i want my money and they must take their airtime on the 071411*** number as i told them to stop the contract they are just happily debiting. I WANT MY MONEY AND TAKE YOUR STUPID AIRTIME BACK IF YOU CAN GIVE YOU CAN TAKE IT BACK, I HAVE BEEN CALLING THE CALL CENTRE NO BODY KNOWS WHAT THEY DOING THERE,THEY JUST BUNCH OF IDIOTS.I HAVE NEVER FELT SO BETRAYED BY THE COMPANY I HAVE BEEN PAYING SO WELL AND THIS IS THE *** SERVICE THEY GIVE ME.HOW CAN ONE COMPANY HAVE DIFFERENT PROCESSES OF SIMPLY CANCELLING THE CONTRACT I ASK??? LIKE REALLY,MEANING YOUR PROCESSES ARE AS MESSED UP AS YOUR *********** STAFF, THE LAST IDIOT I SPOKE TOO PUT ME THROUGH ON A VERY LONG RINGING CALL WITH NO ANSWER.. PLEASE DEAL THIS IT IS BEYOND UNACCEPTABLE. BOTTOM LINE I WANT MY MONEY. I CANNOT WAIT FOR THIS CONTRACT TO END YOHHHHH