Seriously Now??????????????

I had a contract with Vodacom and it came to an end in Feb 2018. The contract was cancel in Mar 2018, I phone to check what I was owing. I was informed R219.00 and was told that will be the last payment. I paid that amount, next month I was told I owe R84.96 which was confusing to me caused I had phone and was told that my last amount is R219. Again this month I've been told that I owe R243.96 and my account is now in arrears. Like what the hell, so now every month I will keep paying for something that was already cancelled. I am so angry for the fact that they keep transferring me from one Agent to another with no help. I was told that I will be emailed the break down of the bill still nothing. The R84.96 I was will to pay but now there's an amount of R156.04 , so in total I need to pay them again R243.96. No Guys this is not right.... I have all my statement but this time around I don't even have the statement for this R156.04