Telkom Sucks

I paid my Telekom router up before my contract ended and that was the 1st of July 2021. I was in KC walked into the Telkom Shop and the lady said i could pay at Pick n Pay when asked will this account be closed she gave the print out and reassured that it would. I have not used the router as we have wifi and since then i have received a bill of over R1000 how is this possible? I would like someone to assist me asap as the customer people are hopeless to say the least. Knowing when my contract ended and receiving a payment squaring it up but yet still receiving a bill in 2022 for over R1000 your people are pathetic and many has had issues with your staff and services. If this is not resolved i will be taking it furthur