Furious

For almost 2 years now I'm struggling to cancel a contract for some sort of Sim card that has never been activated. Atleast once a month R1500 is being deducted out of my account. We've been to Clearwater mall branch several times to true and cancel whatever this is. Got emails which states telkom will consider the cancelation. I can't tell you how many times I've been calling and emailing telkom to try and sort it out. I've got a picture where telkom said on Facebook messenger the simcard is not activated. So what am I paying for? I'm furious as I received another invoice this morning. Is somebody inside telkom using my banking details?