unauthorised debit order

I cancelled my insurance with Anderson in Jan because of the bad services I recvd from them, whenever you call the systems are down or they have a charmain at switchboard who is very rude.They advised me that cancellation takes 30days which meant they will still debit me in Jan to cover for Feb, I agreed, In feb I was very shocked to get good services from one of their retaining guys,I then decided to send and email to Bianca and re-instated my insurance.I said to her they must not debit the pro-rata because I was already covered for Feb so they must debit on the 26th of Feb for March, she agreed then 3days after I told them not to debit they debited. when I send an email 2 find out I was told ''for us to confirm whether we did debit show your bank statement'' I then said if cust wants to claim they are able to check whether you've been paying on time or not she then gave me an email and said contact this person(Neo) I sent her an email to find out as to why she cant resolve the query since she got the sale, no response. I then decided to cc the Neo for assistance till now nothing. because of this I had other debit orders that returned unpaid and I had to pay the bank. ANDERSON!!!