Unprofessional and Bad Customer Service

I was insured previously with Standard Bank Insurance. I need proof that I was insured with them but I can't seem to get it. I have phoned 3 times and emailed about 3 times as well. They simply do not reply to any of my emails. When I call in, they tell me that they will email me the documents. Two weeks later and I'm still waiting.... What else do I do now?