Telkom does not treat its customers fairly and this is disrespecting, also *****ing from the poor.

Telkom billing is insane, I upgraded my contract towards the end April 2019. The agreement was I will only pay R140 per month. since May 2019, Telkom debited R1500 and June 2019 debited R1200. Now they have sent an sms that I owe R1900. I looked at my statement, I can see that someone is making calls and accessing internet using my number. my first Case No. ***5 closed without even providing feedback. The second case no. ***1 logged three weeks ago and Telkom Back Office are still investigating even today. Every time when I follow up someone from back office will call me. I don't enjoy this contract and honestly I want to cancel this contract. Telkom does not treat its customers fairly and this is disrespecting, also *****ing from the poor.