My kids have minecraft and it's a fucking nightmare. We lost one aged account because of login issues, and similar to the OP here, one tablet is now locked out

My kids have minecraft and it's a fucking nightmare. We lost one aged account because of login issues, and similar to the OP here, one tablet is now locked out with seemingly no way of recovery: I tried calling, emailing, signing up to xbox, but basically: fuck off, you've lost the 25 quid and all your worlds.