Breach of contract by Telkom!!!

I have been paying a contract for more then 6 months of R500 every month, but i cannot use the Sim, I have been to numerous stores which is always offline.

I received no data or minutes the contract is not being held by the operator. I am exhausted in every avenue who can I call to get this sorted out? Please advise... If I don't pay i will get blacklisted, I'm sure theirs a customer complaint I can call to report to sue them, please let me know as this is a breach of contract