Debited account on wrong date

I am really angry with old mutual. How can they debit my account two days before I get paid and take every little cent I had left in my account!!! The agreed day for debit is 25th and not 23rd. I am really going to move all my policies to another insurance company who cares for their clients. Their call center is more than the word useless, they tell me it is a campaign they are running to debit people's accounts before the actual agreed date. I mean is not like this is a debt which I am owing them, this is an investment account for heaven's sake. I am really going to move my accounts!!!