Unhappy customer being charged *******ly

On 29 March 2016 I emailed edcon head office to please cancel my VIP membership of R60, of which I received a reply on the 29th to say it was cancelled. At the same time I informed them that I wish to close my account the following month when I make final payment (i.e. end April). On 13 April I receive my statement of which I have been billed the R60 VIP membership, I immediately notify edcon that I have been charged after I have cancelled the membership to which I get a reply it was invoiced before it was cancelled. I asked how this was possible as I cancelled it before the end of March how can they charge me R60 for April when it is not even April and I only received my statement on 13 April. <br> The reason i am closing my account once I make final payment is because Edcon has been messing around with my account. I have been a good payer all these years and because of that that have been increasing my installment quite substatially as they are in financial trouble and are using their loyal customers to pay for the customers that are not paying and I will not be part of that and therefore am paying up my account and closing it, I refuse to pay the R60 after I asked it to be cancelled