Discovery Bank not able to solve online-banking problem.

I am not able to do any online transactions from my Discovery Platinum Card. I have called Discovery Bank numerous times, emailed screen shots of error messages but this problem does not get solved and no feedback is provided. The agents always assure me, the matter will be escalated and I receive feedback within 24 hours. Sadly no feedback whatsoever. This is going on for almost a month now! Really not acceptable...