POOR VODACOM SERVICE

I want to cancel my data contract at Vodacom. I can't afford the contract any more as I am a pensioner now. I get in arrears with my installment. But I corrected the payment and there is no amount in arrears now. So when I paid the money I ask the vodashop to cancel the contract . They said I must call vodacom *** which I did. I had to make a lot of calls before I get any reaction. I ask them to cancel my contract .they said it is not n problem they will send me an email with the amount I must pay and on the email I must say if I want to keep the nr as a pay as you go. . I never receive the email . I I call them again several times no answere Then eventually they answered and after I told them I did not receive the email the said they send it again. This second email I did not receive aswell. Then I call them again 12 times no answere . Today I call again the 3rd time they answere . I told my storie again said I did not receive any email. They lady told me she send it again. I ask her did she have my correct email. I wanted to make sure because I receive emails from vodacom about promotions all the time. The lady told me she quickly want to fix my email. . The same email that I receive promotions on the same email I received my contract on. First they told me I have to pay R255 to get my contract canceled now all of a sudden It is R538 because I have to pay this months installment. The operator today said that is the amount the system generates. Is this fair is this just plain forcing me to pay them another month s data which I have not use because I used capitec data which is cheaper..And at home I use my daughters wifi. I'm unwilling to pay vodacom more then the initial R255 rand. This is poor treatment from a service provider whom I used since very first cellphones was available in our area.