Hi all. I'm looking for any advise or suggestions or help with my situation. This is a long one so please bear with me.
A couple of weeks ago my son comes in from school and tells me that his class are going on a Christmas trip. Then last week before heading out the door to school he tells me that he needs the money for the trip today. I asked him for the information slip and permission form that the teacher would normally send home and he said he didn't get one. He showed me €8 which was his own pocket money and asked me for the rest €7 to make it €15 in total. So I gave it to him and off he went.
Monday morning he gets up and tells me he is going on his school trip today! I was surprised as he hadn't mentioned it before and again I hadn't got a note from school. He said the teacher never gave out any notes about it. Although I thought it was a little odd, I believed him and did him up a large packed lunch and gave him another €5 spending money.
He comes in Monday after school and I asked him about the trip. He told me he made a mistake and it was on Wednesday but he forgot his permission form. I told him to hang onto his spending money and make sure he brought the permission form home The next day so I could sign it.
So in he comes today and I asked for the permission form and he said his teacher said he doesn't need one. Then he mentioned something about the trip costing €9!!! Straight away I questioned him about the €15 he told me he needed the week before for his trip. He started crying and denying that he ever said the trip was €15. I then asked where the €5 spending money was and he said he left it in school at first. This went on for a while with different story's coming out and he was getting caught up as he was telling lies.
Bottom line and the truth that was eventually came out and here it is:
He knew he only needed €9 for the trip but asked me for €15. He spent the €15 on sweets and on Monday used the €5 I gave him along with €4 of his own money to actually pay for the trip.
I am so disappointed in him and just so upset that he would do this. He only ever has to ask for anything that he needs and depending on how much he needed might be asked to do jobs around the house to help earn it.
As punishment I have removed his xbox (which he adores) and will be going to see his teacher in the morning to let him know that my son is not to go on the trip. He has also been given a very stern talking to and sent to his room for the evening.
I know I should have been more on the ball about the permission form as I don't think they can go on trips without it. I'm kicking myself for not quizzing him more on it and insisting he brings it home before giving him any money. But thenI trusted him and I never thought he do this.

I know it's only a small amount of money but thats not the point. I feel he effectively stole from me and lied to me.
Is this too much punishment or not enough?
What else could I do?
Any helpful suggestions to help us all move on from this would be greatly appreciated.