Contract phone

Hy I had a contract phone with Telkom, from 2015 to 2017 July, when the contract expires I phone to request the cancellation form I fil the form month before the contract expired, I email it, but they keep on deducted the money I call them numerous times keep on sending email to consultant I spoke to, no one help when I found out today the account still Active and they black listed me. Please help me Hellopeter I do have the copies of emails of all the conversation, I dont know why cz they block my phone it wasnt working from August last year