Yes, you can appeal if you think the decision ios wrong. Ideally you should do this, within one month of the decision letter, by filling in the GL24 that should come with the letter.
How long do I have to appeal? How to submit an appeal We have a lot of appeal resources should they be neccessary - but let's hope that they are not! If it does transpire that you are not happy with the decision, please come back to this thread and we will let you have more info.