MFC breaking Agreement

Had my first car through MFC with no issues what so ever. Now it seems something has obviously changed in the last 10 years. These guys now just decide when day want to deduct your debit order, does not matter what date you agreed on and what contract you signed. They feel it's fine to deduct on the 22nd even if the agreed date is the 25th. Fully understand if the 25th falls on a weekend, but the last two months it's Meen on a Monday and a Thursday. Yest MFC just deduct as they see fit. First on the 23rd and now on the 22nd.