Not cancelling a policy ofter written notification

I sold my vehicle to a car dealership. I then notify per email on 2 July that all the policies and short fall must be cancelled. Even after I provided the policy number (must be correct as I had to make a claim previously) it could not be founf?? From that period up to dated their has been more than one e-mail exchanges as well as phone calls were this request was repeated and requested that deduction must be stopped and funds be repaid. With the last phone call the comment that was made is that the manager can not understand why this was not done already and he will do it personally!! Not sure what was done as funds was deducted again. Funds deducted on 1 July, 27 July, 1 August, 25 August. The cherry on the cake is that I have to pay admin fees for refunds after deductions are still been made after the request to STOP. Sort this out on the vehicle that was sold.<br> T&amp