None of the call centre number are answered

I have an Edgars Hospital Cash back plan which is administered by Hollard. I have called several numbers including Edgars and have been holding for over 20 minutes on all using my cell phone. I need to log a claim but am really struggling to get through and there is no details of any of their processes online except numbers which are not answered. Maybe I should really consider paying for a service for years only to get this service.