Not impressed with MiWay Insurance

I’ve been having a really frustrating experience with MiWay. I recently added mechanical cover to my existing insurance policy and made it clear during sign-up that the cover should only start at the end of the month. I also asked them to update the debit account to my husband's details. When I received the paperwork, I immediately noticed the account number was incorrect and contacted them twice to have it changed. Despite this, the payment was still debited from my account just two days later—using the wrong account and on the wrong date, even though I had specifically requested the cover to begin at month-end. I then requested a refund since the documents clearly state that the cover only starts at the end of the month, meaning I’ve paid for something I’m not yet covered for. It’s now been seven working days and I still haven’t received the refund. I had to follow up again today, which makes this the fourth time I’ve had to contact them about something they claimed was resolved.