Expired contract term not canceled

I bought a phone on contract, on buying that phone I was offered 2 Sim cards, one with airtime and the other one with data, when the contract expired I tried to cancel, I first went to the store and they told me to do it over self service of which it was not successful, I renewed only the one wthi data but I'm still paying a lot, I sent customer services some emails to request for a cancelation they promised before Dec that I was the last month, and I've started this process in Sept 2022,until now my issue has not been resolved, I'm still paying.