Bad service

I have just taken out a short term insurance policy with MiWay. At first I asked them to debit my account on the 25th of the month, but I changed it afterwards to 26. They debited my account on both of those dates. When I phone them, I was told by Miyelani Baloyi that he can see on the system that they debited me twice, but I should email him a statement of my bank account before they can amend it. I could not get a statement from my app, because the app only had it until the 24th. I emailed him and explained. He has not responded to any of my emails. I phoned MiWay again a few times, only to be told that someone will phone me back within 72 hours.