Blocking of Revolving Credit Plan

I have a revolving credit plan with Standard bank that is up to date. I have already paid 15% of what is required for a client to access funds but I am told the account has been blocked. I have been to the Selcourt branch since early January 2015 and it has been 4 times been to the same branch with no help. I am told there is nothing they can do because they don't know what is the problem.