Cancelled Mobile Data service but still receiving invoices

<p>I have been in-store (2 months ago) and filled in the cancellation forms for my mobile data contract which was expired (the full term of the contract is now complete). I have since then also used sent the same forms by email to their retentions / cancellations department (2 weeks ago). I have also logged a dispute on the Telkom dispute logging system (case number ********** 4)</p> <p>Today I have still received an invoice claiming that I owe payment even though I cancelled the contract 2 months ago. I am most unhappy about this - it appears to be taking Telkom several months to process cancellations - not something I should be forced to pay for.</p> <p>Why don't they have an online portal for filling in cancellations?</p>