iTalk very poor service

In December 2024 I app**** for the C-connect sim as I was first interested in the service, we went through the process of opening an account with the agent. We had a disagreement on the debit order date as I advised that I do not get paid on the 23rd of every month, the agent told me she cannot change the date I must go and change it at the bank. According to my knowledge its the service providers duty to that to do that by cancelling the first then we go through a new debit check mandate. After that I decided to cancel the service within the stipulated period as per CPA. to cut it short, I was promised that the service has been cancelled and the debit check too. it has been going off my bank account every month up to April 2025 and I am sure it will go off again this month, my bank tried to intervene but advised that I should engage with the service provider, which I did. No refund and no email response to the one I sent with the proof of my bank account where it shows it was deducted. I tried contacting them this morning and unable to go through.