Pathetic company

Got a nice message today that my car insurance is cancelled. Debit order went of but insurefin for the 4 time this year is blaming the bank. I have offered to eft the money and cannot, I have sent bank statements to proof I have money in my account. I called in to the receptionist at insurefin and was promised a call back, when I called back they refused to answer my calls. I found out I have been sitting with out insurance for 15 days. I hope finsure knows if I'm in a accident before I get a new insurance that I am going to sue them. This error accounts every 3 months. Debit order goes off correctly then one month nothing. Absolutely pathetic