14 yo stepson makes it clear that he will not give his teachers any notes I write to them! What would you do?

I gave a notes for 14 yr old stepson to give to his teachers. Each day I asked “Did you give them the notes?” He would say he “forgot”. Finally 8 days later, with his father present, I asked him point blank if he planned to give the teachers the sealed notes I'd written. He said “No I don't.” His father asked him why he would do/say such a disrespectful thing and why did he not want us to communicate with is teachers. He ignored the question. His father then told him that he would not get the $50 he needed for a field trip to Medieval Times which he was looking forward to and not to ask for money from him other than for basic necessities until further notice. My husband RARELY disciplines his children in any way so I was shocked that he was stepping up for ONCE. Now, 1 week later, he is giving him money again (for ice cream at school and other non "basic" things). I think when the field trip deadline comes the son will also get his $50. What to do in this situation?