Lack Of Service

I have tried cancelling my policy multiple times. Numerous phone calls - all which I have been on hold +7 minutes and then it hangs up. I have sent email on Thursday 05 April, and today 09 April 2018, a consultant from Momentum phoned me today regarding the mail I sent thursday, and advised that she will contact my broker in order for me to cancel, and that he will phone me back "Today". I still have not received feedback, and I need this insurance cancelled, as our new policy starts 01 May 2018.