@John_B2021 good news in getting your email back, it isn’t 100% clear as to what has occurred to get you access again, but I have to reiterate @Kath_F message above, unless you have a current active VM broadband subscription to which the email address is attached, then this mailbox and address is orphaned and absolutely WILL be deleted at some point in the (probably) near future.
In this case, regard it as a ‘stay of execution’ and take the opportunity to move everything to a non VM email address - the next time it is unavailable (and no ‘if’ about it, it absolutely will go at some point), you probably won’t be so fortunate in getting it back.
Of course if you do have an active VM broadband subscription and the address has been associated with it, then my apologies and ignore all of the above.
John