Well I hade a account error problem caused by your payment system

Well I hade a account error problem caused by your payment system. I change my payment date from the 25th of each month to the 1st of each month as it shown on my rain website, but a debit order still went thru on my account without my knowledge and were rejected from my bank account. This leaves me with no internet as I work from home and also I am now stuck with additional bank fees caused of the debit order not going true. When I called rains offices they didn't really had an option to assist me even with a option to pay a couple of days later. This leaving me in the dark to a fault that's not my fault.