Telkom Cancellations

On the 12th Of February 2018 i submitted a cancellation form to Telkom to cancel my 100GB LTE package, the contract expired on the 18th February 2018. I followed up at the end of February 2018 and was told that the cancellation takes 21 working days to process. The account still has not been cancelled and i am still receiving invoices for this account.I do not need this package anymore thus when the contract expired i cancelled it. I have taken the steps of stopping payment. As far as i am concerned i have done my part and submitted the cancellation form.