Telkom is doing ***** with my then contract

I won't be abused by Telkom, No. I canceled my contract accordingly and was told I won't pay any amount hence I canceled within 30 days. Was given case number but now they demanding R665 00 from me. Telkom is doing ***** and I won't be bul**** by url.Wish I never took a contract from url! Demand answers as to why Telkom is doing ***** with my name. My number ***