Refund refusal

My son, who is autistic, recently purchased roughly $610 worth of assorted gems, candies, and what-not for several of the games he plays. I was entirely unaware he could even do this and immediately removed his ability to do so; he was unaware he was really spending any money at all (he's 14, but operates at about a 3rd grade level).

I got notification of the purchases some 2 days after they actually happened, and immediately requested refunds through the proper web page, etc. All but $10 were denied refunds, so I went through the page again, and for each item that was denied, explained the situation and resubmitted.

They were denied again - I called support and was told there was nothing they could do, and that if I had called after the first denial then maybe they could've helped but at this point, because it was denied twice, I was out of luck. They advised me to check with my bank but also advised that if I did this, it's likely my ID would be suspended.

I'm flabbergasted; I've been an Apple customer since the iPhone 3. Has anyone else experienced this? I'm just sick that I'm basically out $600 in the middle of a pandemic and this giant corporation really couldn't seem to care less about it. Everyone has been super pleasant, of course, but the message is the same: nothing we can do, we can't help you, you can contact your back but if you do we'll suspend your ID. I'm just sick about it.