Post cancellation charge added without my consent / agreement

I had a data contract with Telkom that I took out 3 years ago, in September 2023 i logged a cancellation with them that as of 8th October 2023 the contract must be cancelled which is the same day the contact would have ended, this was confirmed to have been done successfully on the 29th of September.

After a few weeks i noticed the invoice amount for October hasnt changed which is when i reached out to the contact center and was informed that there is some post cancellation bull**** that was activated that meant i would be paying for the full month of October despite the cancellation being completed on the 8th.

I NEVER agreed to this nor was i given and option to have a choice. Telkom decided on their own that they would charge me for the full month despite no consent from my side. Upon contacting the call center and finding this out I was told there is nothing they can do as the data has already been loaded.

I have NEVER used any of this data on this contract and still to this day have not used anything, but they are refusing to remove the data and reduce the bill.

Absolutely ridiculous that a company can add on charges based on options that was never even given to customer, someone made a mistake adding that option on their side or did not even bother to ask me if they could, simply loading it and now refusing to remove it.

Stay away from telkom as they will do the same to you.