*******ly blacklisting clients!

I queried my very high account with Cell C in May. After numerous failed attempts trying to get the information (what I was billed for) from them, I still have not received it. First they treat me like a ******** by suspending my account (even though I raised the issue with them upfront!), then they blacklist me without sending me proper information on what I am billed for (do you just close a query and not get back to your clients?). <br> <br> If there is anyone at this company that is capable of assisting me, please please please will you help me.