Insurance problem - Close Premium Finance

Getoffmycloud

I wonder if you could help me with a problem I am having with my insurance company, which is through Close Premium Finance. I took out the insurance in June last year and quickly realised they wanted the payment on the 25th of every month and I don't get paid until the 28th and I was getting charged £25 every time I missed a payment. I wrote to them and explained the situation and they wrote back changing the date to the beginning of the month. Perfect, no problems for a few months. Then in January they decided to take the payment in the middle of the month and I get another charge. I emailed them about it and said it was their mistake and asking for the return of the £25 charge. They never replied so I sent a letter. They still haven't replied. This month they've done exactly the same again and guess what another £25 charge. The charges are more than the cost of my insurance so this is costing me a fortune. Can they get away with this? Any idea what I can do when they are ignoring my letters?