PSO2 on vita @ Error 691

[MakanaAzusa]

It has been awhile since I last signed in to the PSN network. ( about 5 -6 years now )

well since sd cards are cheap and now that the vita hacks are now easier to do I thought why not.

Well everything went soomthly until I tried to login to PSO2 on vita.
Error 691 popped. Your ID is tied to another PSN account.

a) I remember the email of that PSN account not the password.
b) The email that I used previouly has been deleted ( too much spam on that email ). Its a gmail account.
c) tried google's email recovery but no it did not work ,
d) the playstation store still recongizes that the account is still active

who would know that PSO2 on vita be so troublesome. However, since I have come this far, might as well finish the process


so what now ? any ideas