Cellc Contract department

I have been with cellc for years now. My contract expired in December 2021 and i cancelled it in January and February 2022 respectively but I'm still getting debted for the contract even after I told them the reason I'm cancelling it was due to poor network coverage and I was told that the contract will terminated with immediate effect. At this point I'm exhausted of their poor service, if you want to be a happy contract customer stay away from cellc.