Poor incompetence failure to cancell service

I have cancelled my line with telkom last year. I called them then was advised to download the cancelations form and email it the adress stipulated. Now all of a sudden i receive a letter i owe them money from last year and have 14 days to pay or they will hand me over. Well let me say this Telkom try me my next complaint wull be mailed to icaasa as i have all the proof that i have followed your cancelation process but your incompetence as a company has prevailed once again. You have 48 hours to sort this out then i take the matter to icaasa.