Guardrisk Insurance goes MIA

Received a call on 24 March re: a cancer cover. Told Samuel I will take the 31 days they give to review before I make a decision. He placed my call through to his colleague who explained that they can only place a debi check on my acc if I approve it. I never got a request to do so yet it is attached to my acc. He also said it would not be more or less than agreed upon yet the max amount to debit is over R2000. I have emailed and called numerous times this week yet no response. A lady called me on Monday and I asked her to please cancel the debi check as I am not taking the cover and to also email me confirmation of this. To date zero to nix communication. To say the experience has been pathetic is an understatement. What would I need to do to get a response and get this debicheck off of my account?????