Worst ISP, Supersonic invoicing months after cancellation - ****************.

Please help escalate this **************** I sent an email to their cancellations department on Jul 15, 9:09 AM as instructed by their call centre, and after weeks passing of not receiving any acknowledgment/confirmation regarding my cancellation, I then contacted call centre again and spoke to thandeka.dlamini who acknowledged my cancellation and confirmed that end Aug would be last payment as it takes 30 days for cancellation to be processed. If you go on my profile you will see that my data usage has been 0 since July (as expressed in the email, I am moving and no longer need the service). Fast forward I get an invoice in September then I contact call centre, in whcih the agent confirmed that I am not supposed to pay anything and that she will query this amount as it is not justified (according to her, this looked like a top up fee and I was never a top up customer - I was on an uncapped package). Today, I get an invoice for October to pay my previously subscribed uncapped fee + the fee the agent had said looks unjustified... Please advise why Supersonic does not want to accept this 'break-up' and insists on billing me over a contract I cancelled. Hello Peter please help escalate this issue!!!