I did send about 30 tickets for the past two months and no response from them!
Also, they've asked my my last transaction but what if I don't remember.
I know my username (email) and password, authenticator has stopped working and I did not log in for the past 8 months I think.
Wait for their response and see how things go. If you can't provide the details they are asking you, it's very unlikely you'll get access to the account again.
If you didn't use the account for eight months, then you should already have an estimation on where you last made a withdrawal or which coin was it at least, that should help.
As a piece of advice though, whether you manage to get access to your account again or not. I suggest to not use Yobit again. It's with no doubt one of the worst, If not "the" worst exchange out there.
Thank you!