Worst service. !!!!!!!!!!!!

I upgraded with vodacom a few years ago via the internet/phone ( been a client with them for more than 10 years) and took out another top up account. I spoke to a lady on the phone who did my upgrade and asked me if I want my contract to carry on when the top up amounts are done to which I rep**** NO and that I would rather upload airtime/data on my phone myself if it runs out. I knew it wasn't likely to run out because I've got wifi at home and at work so I wasn't worried about that. Just to get to the end of the month and see they deducted just over R4000 on my account. I reversed this payment because this was not the amount that I signed for on my contract. Needless to say they NEVER helped me. I was the one that phoned them to get it sorted but not 1 consultant or manager helped me. Then they got 10 different lawyers involved to which I spoke and said that they should listen to my recording . They are always quick to begin a call by saying they record everything!!! Now they are saying I owe them R20 000 . I'm not able to do anything because of Vodacom!!!!! This looks bad on my name but NOBODY is assisting me!!!! I tried to contact their lawyers and them but they're not helping !!!! I do NOT owe Vodacom R20 000 AND WOULD LIKE TO RESOLVE THIS ISSUE ASAP!!!!!!!!!!!!!!! WORST SERVICE I HAVE EVER RECEIVED FROM ANYBODY