The Windows 10 Edition of Minecraft was Already Claimed

My Minecraft account may have been compromised, I haven't played Minecraft in over a year, a few days ago, I was hanging out with a few mates and we decided that we should play Minecraft, for old times sake. When I logged onto the account, we attempted to go onto a server which we all enjoy - Hypixel, just for me to find out that I have been permanently banned. We all thought that this sucked, quickly ignored it and moved on to a different server. Shortly after, we switched to Windows 10 edition, just for me to find that the code for my version had been used (See attachments below). I really want to carry on playing and supporting this game, however, if my account is not usable due to someone else using it, I may stop playing. In the past, I have never shared  the account details with anyone, not even the email, so I have no idea how my account was taken/