Device Obligation/ Carryover

I finished paying off my device in April 2020 and my contract number continued with the benefits offered along on the contract. I also had wifi router and I upgraded and took a additional 1 which makes it now 3 numbers I have contracts with Telkom.

The wifi touters I took were supposed to be 20Gigs of Data 10/10 however I have been paying R278 for both devices however the other number was getting 20Gigs (10/10) and the other 10Gigs (5/5).

I decided to cancel my contracts with them and only got confirmation for my Cell contract and the two routers I did not get any feedback. On my mobile app it states that I do not have any contacts with them but today I got a Bill of R1 900,70 I must pay end of this month. My normal debit order was R378..

When I try to contact them they never seem to respond..