Contract Cancellation not done!!!

I cancelled my contract with Telkom on the 25th of May 2021. The sales person at Blueroute Mall advised me I will get billed in the month of June for the last as it will take 30 days for my cancellation to be completed however on the 30th of July 2021 I was billed again which I do not understand. I am very disappointed as they billed me again and what the sales person advised me was not correct. Up until today I am still receiving SMS's saying my contract is due for renewal.

I would like my contract to be cancelled with immediate affect and the funds that was taken out of my account to be refunded to me. I am not even using the router anymore.

Kind regards Lorenzo