Duplicate life premium debit orders, with no feedback!

I am a Liberty life client and have had a life policy with them for over 10 years. Recently I requested Liberty Life to move my debit order date for my monthly life premium. Even though the date was changed, Liberty then debited my account 5 additional times, with a total of over R4000! It has been more than a month and still no resolution. I have called the call centre 4 times, queried via my broker twice and still nothing. I have to chase for updates and when prompted I get "We are still investigating". Is this how Liberty Life treats their valued customers? This amounts to theft...I will be moving my life insurance to another Financial Institution.