RSAWeb deducts money from bank account without authority

Having given notice to close my account..... RSAWeb insisted that I pay an additional month as I gave notice on the 4th day of the month and it was not acceptable to them. I then paid for the month of November (which was supposed to be my notice month) and for the full month of December. On the 1st of February- nearly 3 months after I initially gave notice- and having accepted that my account was closed..... RSAWeb suddenly started to deduct premiums from my account again. They had no authority to automatically just deduct money from my account.