Telkom billing system

I took out fibre from Telkom with the amount of R350 per month. Whenever I pay late they would add a R200 on the account. Which I normal pay. However there came a time when I didnt pay for two months and they disconnected my line. So I decided to take out prepaid also with Telkom where u just pay when u need the wifi.

Because my line was disconnected I was under the impression that the billing would stop. But apparently it doesnt stop untill you pay the arrears. At the time of disconnection, my account was R1060. I thought that is the amount that I must pay cause Im no longer using their services that they cancelled. Last week I received a call from debt collectors saying I now owe R3700. Apparently they still bill you untill the amount is paid up. I tried to make arrangement but they said Telkom will still add a monthly fee even though I have not been using their services for the past 4 months.

I am so frustrated as I cannot afford to pay the total amount and even if I make arrangements the account will never come down as Telkom still add their fees.

Is there any way that you can assist or help me understand whats happening here because neither Telkom or the debt collectors is of any assistance. How unfair can a company be to expect you must pay for services that they suspended in the first place.