Poor Service

I have been trying to get hold of Lottoland by dialing the call centre for 3 days. I called 17 times. I managed to get through today and asked to speak to a supervisor. I was told a supervisor will phone me. After about an hour I phoned again I was told the request to be called will be followed up on. After 16:00 I called again and the call centre was already closed. I have sent emails and have received responses but I want to raise the matter with a supervisor. Its shocking that no one phones me back!!!