@MojangSupport I can't migrate my account. I've always just had a username and password. The email with the information asked for is on an email on a server that closed down 7 years ago! Is there anything else I can try?

Please send us an email at msft.it/6011bydMv and we will assist. Remember to attach your Transaction ID and account name / Gamertag. ^TK

That's the problem, I don't have the transaction ID and have no way, that I know of to get it!

Also, been there already and they tell me they can't help.

Do you happen to have the ticket number so that I can review what took place? I'll do my best to assist you from there. ^TK

I think it was 3833061. I've pretty much resigned myself that nothing much can be done and if I'll have to buy it again if I ever want to play.