Complaint.. Need to cancel contract

I have tried on numerous times via different methods to get a contract canceled. I used their self service option.. Sent msgs via chats with an operator.. Also sent three emails to the cancelations department.. And still not even an acknowledgement of my query. One of my contracts is due for upgrade but I want to cancel it. Futhermore even at their store in Ladysmith in the Oval shopping center.. The customer service is so bad.. All they told me when I tried to make a payment was that they don't accept payments in store.. I must do an eft.. Useless service provider if u ask me.