Unauthorised billing.

Hello Peter. My name is Philip Kekae. I had a contract with Telkom mobile which then expired in November 2023. I was paying R99 a month. After the contract expired they kept on sending me data and airtime but now the price changed to R106. That's when I called to cancel the contract. They told me the cancellation was successful. Since then they've been billing me every month. On the 31st January I was owing R628,99 which was debited on the 08th Feb. Again on the 1st March R790,99 was debited. I'm so disappointed and confused. My number is ***.