TELKOM ACCOUNT CANCELLED BUT STILL BEING BILLED

I cancelled my Telkom account about two months ago. I keep receiving text messages on my phone saying my account is suspended and legal action would be taken. How the hell must I pay for something I do NOT use???? I already moved to a different region in this lovely country. I do not have any ADSL line nor do I have a modem set up or any connection? I CANCELLED the account.