TELKOM did not cancell my account as requested MONTHS ago

I am very unhappy about Telkom's service. Cancelled my landline MONTHS ago and still get bills. I have proof of an email that Telkom send me confirming that they've received my cancellation request. I've been phoning your *********** people A LOT OF TIMES and still getting bills and you even charge interest!!!

If my credit record is effected by this I will have to get legal advice because this is unacceptable.