Telkom not acknowledging and processing cancellation of contract

My Telkom data contract expired and is now running on a month-to-month basis. I phoned Telkom to inform them that I want to cancel the contract, and was asked to complete a cancellation form and email it to ********** I sent the email on 4 Jan 2018 but never got an acknowledgement from Telkom about the cancellation. The contract was not cancelled and another debit order went off my account. I have since spoken to two different consultants on 5 Feb 2018 and 8 Feb 2018 and forwarded the original cancellation email to them. Both promised to get back to me but never did.

It seems like it is impossible to cancel a contract with Telkom, so people should be wary of entering into a contract with them.