At my wits end and no resolution in sight.

I have been attempting to get a cession letter out of Standard Bank since the 11th of September. My issue has been escalated 3 times and there is still no resolution to the matter. I have the direct line of a team leader who promised to call me back (immediately) to no avail. Combine that with the fact that according to Transunion, you have black listed my account, in spite of the fact that when I was in the branch yesterday, your consultant informed me that my accounts were closed. After attempting to resolve the matter through your call center, I was passed through to 5 different departments, none of which knew why there was an issue on my account as their system didn't indicate any issues (not even credit or legal). I have absolutely no idea how to resolve these issues as calling definitely doesn't work and the consultant at the branch with whom I dealt yesterday seemed very competent and caring and didn't pick up any issues with my account. I cannot call and I cannot go into a branch for assistance. Where to from here? As you may be aware, black listing is quite serious if it isn't resolved and at this point there is no resolution in sight.