Telkom spend limit theft

I recently got a new Telkom contract. Which was through telemarketing from some company in Cape town. All the promised package was delivered. However the contract spend limit is R500. I get the shock of my life everytime the monthly invoice is sent to me. I have sent out countless of emails for the spend limit to be made zero rands. The phone number I'm suppose to dial isn't working.

I cant go to a Telkom store due to the Covid-19 lock down. Instead of paying R500, R1000 will be debited from my account and there is nothing I can do about it. And additional R500 is alot of money.

The only response to my emails is to get referred to another centre and be given a ticket number. Nothing is being resolved. I'm so disappointed. The app is pathetic I can't reduce any limits there.