WebAfrica charging for cancelled services

I cancelled one of my two fibre lines with WebAfrica earlier this year. To my dismay the line has re-'appeared on my Dashboard and I am been charged for it this month. I spent the whole day on the chat interface trying to explain that I should only have one line. The experience has not been good. I tried more than once and got deflected, told I haven't paid, even though they are charging me on my credit card, and every time told "we are escalating your request", and then nothing happens. I don't know what to do anymore. I unable to cancel this non-existing service.