> I cannot get into the 362 address I need it
Just clarify, do you mean nearly 400 contacts of Gmail account are missing?
> it was changed to 363 instead of 362
It was not possible to be changed itself or by Google, 363 was highly likely created by yourself or someone related to you.
Anyway, you lost control to the 362 one and tried getting it back. Did you ever associate your cell phone or 2nd email address (such as 363 one) with the 362 address?
do you have access to this phone number? if so what is it?
Get a verification code by text message at: (•••) •••-••17