Unresolved dispute

I logged a dispute on the 14 of April with african bank i was told the investigation will take 30 say excluding weekend now is 30 day I have to go to the Branch to ask what is the the status no sms or call as if it was my fault the lady from customer service she promised to call back she never does yo African bank I have to run away from banking with you no this is too much she says she is calling visa to followup the matter they only follow up when I visit the branch or call then is done