Unfair and unacceptable

In Dec I was asked to sign a new more expensive fibre (WiFi) contract. Cell C suspended me at this time. I chose not to do take out the new contract and migrated. They are still charging me and yet I have no service from them. I have tried my best to communicate to end the contract, by using their website and was told it would take 24 hrs but have heard nothing in days. I emailed them to no avail again. I have searched the internet for cancellation form - again nothing. Don’t know what to do. Think they will just continue charging. They know how to do that!