Cancel my contract, stop debiting my account

I am emotionally drained and deeply frustrated by getting assistance for simple contract cancellation. I have been sending emails and calling multiple times to cancel my contract as I am not using the sim card. I'm just paying for services I never use. I was given this number to contact for cancellation 082135 and ***/9 but whenever I call there is no option to cancel of to talk to an agent, it keeps referring me to talk to TOBI, TOBI cant help and also cant refer me to speak to an agent. Please cancel my contract.