Pathetic Service From Standard Bank

I requested a pre approval for a home loan from Standard Bank that was approved. Since then no communication. It has been 3 weeks with no response. I have sent numerous mails to no avail - made a huge number of calls, also no reply. A lot of promises that somebody will phone but still waiting. I have send a few mails to the complaints department as well - also no response. The worst of all - there is not a single person that will take responsibility.