Incorrect premium debited from my account

I contacted iwyze on 16 July 2015 and my policy was amended with car hire and additional benefits. We agreed with the consultant that the cover start date will be 31 July 2015, meaning that no pro rata applies. On the following day, 17 July 2015 a certain amount was debited by iWYZE from my account and I don't know what the amount was for. Again a debit order went off this morning for an amount that is more that the total premium that we agreed upon and is on my policy documents. When I phoned iWYZE this morning, I was told that it was an error from the consultant's side. My question is when am I getting back the money that was debited from my account without my consent and I am not getting any answer on that. This is not the first time I have to incur telephone bills because of a 'mistake' made by iWYZE system or their consultants. Unfortunately this affects my bank account and needs to be sorted out as soon as possible. iWYZE do I have to write on this page complaining about you every month?