Telkom Refuse to Cancel my Contract

I have had a terrible experience with Telkom, the refuse to cancel my wi-if contact. I’ve been trying to cancel the contract since last year Dec (2018). Now in Feb they cancelled my SIM card but they are still debuting my account! The contact was initially R550, but half way into the contact, they started charging me R1050. It’s impossible to get hold of them to get understanding about what is happening with your contact. All I want them is to stop steeling my money by charging me for a service that they r not providing. It’s unfair and things are tough for everyone but it doesn’t mean that they have to get customers money by force. This is rediculouse Telkom! Please get this matter sorted out ASAP!