****ED OFF!!!!!

I am now SICK of dealing with these idiots from vodacom!!!!! 2 years ago may 2016 I opened up a contract for my phone in my grans name. After 3 months I changed the contract into my name and all was successful... then December 2016 my phone was cut off cause I was not paying and not coming off my account so I went in to settle the account of R1800. After this the money would never come off my account I had to physically go into a store every month to pay cash on my account but with the consultant that changed the contract into my name he ****ed it up somehow that the account always showed I owed a R0 balance but when entering in my ID number it showed I owed money (now try explain this to 1 of the consultants in a vodacom!!) Now after 2 years my contract came to an end in may 2018 which I canceled immediately after a consultant contacted me to upgrade. End of may my contract was canceled and I received a R0 owing invoice.... now in July I get call after call from a vodacom call centre saying I owe R700.16 EVEN THOUGH I ENDED THE CONTARCT AFTER IT WAS PAID IN FULL!!!!! Today 18 July 2018 I get an SMS saying if I don't pay my phone will be cut off. I went into Vodacom Alberton City in which they said I do infact owe money but no one can tell me what i owe it for!!!! So I just out of frustration paid the owing balance and walked out.. NOW CAN SOME1 PLEASE ****ING TELL ME WHAT IS GOING ON CAUSE I WILL NOT PAY ANOTHER CENT TOWARDS THIS COMPANY!!!!!!!! My contarct has ended and I am on pre paid how the living **** do I still owe vodacom money!!!!!!