Debit went on the wrong date

I never thought that one day I would write a complain about Miway insurance after more than 5 years of pleasant service with them. I have never been so furious with a service provider than I am right now with them.as per agreement with them and my policy schedule debit order is supposed to go off on the 21st of each month as I get paid on the 20th. today is the 19th on my brokest day and debit order went off and as a result my account is overdrawn which will have that incident recorded on my portfolio for 24 month,which will affect my credit scoring and risk rating should I need any financial assistance.to make my blood boil even further I phoned the call centre only to get a message that they are closed.I'M very furious!