Contractual dispute

I have had a horrible experience from Telkom with my Telkom Mobile contract. Its also my learning curve to actually no participate in their services ever again, no matter how unbeatable their prices are. My 24 month phone contract ended in Jan 2020, and i kept on being billed, and when I inquired in Feb, I was told that the contract is on a month to month basis. I logged a cancellation request, my account was already outstanding. I could not cancel because I had to settle the debt first. Its November 2020 and I kept on being billed with the service that I am not using anymore. I am unemployed, I don't use their service anymore, my account is suspended, my bill is increasing every month, and I cannot totally cancel the service since I have to settle first.

No logic. So what if I get employed in 2053? Please help