BAD SERVICE FROM TELKOM

I had a sum contract with telkom which, I took on 2020 due to lockdown. I struggled with signal though I'm living in an area where is dominant. I called and asked for help because, I could not do my work anymore and anywhere. No one helped me until I got another service provider which I am still using to date.

Telkom is still debiting my accounts even though I have not used their service. I requested them to give me my usage, as proof that I was using their data, they can't give me. So why are they demanding money from me, for the service not rendered, even the months I paid for, for no service they must refund me. I nearly lost my job because of their bad service.

Can they please stop debiting from my account, also their call center is useless. Not helping with anything. Telkom bad service must stop. How do you demand money for no service, I haven't used this sim since because of bad or no signal and they never assist me with anything