Hello, can anyone help me with this issue?

I got banned on roblox a couple years back for a reason of which i still dont understand, either way because its linked to the xbox account i own, i was going to make a new one under my main email address (i use this email for literally everything) only to find out that the email has been used on an account i do not have access to, nor do i recognise the number in which it uses either (i have adhd so i can remember every number both me and my mum have owned from the past 10 years) xbox support does not have an option for this so im stuck and i do not know what to do, many thanks!!

:)