ExH telling DS about his problems

[MyMushroomsInATimeSlip]

ExH is using phone call contact to tell DS8 about his money problems (hasn't got any).

DS is already reluctant to speak to ExH on the phone and says the phone calls are boring. I've already been blamed for stopping DS talking to him on the phone (which I'm not!) ExH contacted DS's school last month to "report" this resulting in DS being spoken to about it at school.

There's a long history of ExH being an arse to me. He sees DS infrequently (monthly -ish) for a few hours only.

All advice welcome please. It's infuriating and not very helpful for DS

@MyMushroomsInATimeSlip for a START you need to tell school that if they choose to speak to your son again behind your back without permission you WILL be reporting them.

How old is DS?

DS is 8. Presumably they had ExH 's permission to speak to DS though. I kind of understand that they have to check things though it is frustrating.
DS seems unconcerned as he got to miss a lesson he doesn't like!

Wait, what's it got to do with the school whether your dh talks on the phone or not to your ds? They took him out of class just to do this?

I presume they were checking all was ok with DS at home. I'm not overly concerned about the school's response. I'm more bothered about DS having to listen to his dad talk about his problems. ExH is completely unreasonable when I try to discuss anything.
Do I put a stop to phone calls? I know DS wants to

Are the phone calls part of a court order? Or by private agreement?

I don't remember phone calls being part of agreement at mediation. DS was only 2 then.

ExH used to phone me to find out how DS was when he was younger then it became him speaking to DS instead.