Hmmm, i think i may have a similar issue.
I upgraded in december, sl offered the a pretty price for the premium quaterly-plan.
On my profile-page, under account i'm premium-member, but in my sl-profile inworld, nothing at all.
Also still waiting on the promised bonus of L$ 1''000 for inscription, and the weekly amount.
I said me, ok let's pass the hollidays, maybe with beginning year all will be done. But nothing, still waiting !
I think will have to send a ticket, or call on one of the tel-number for assistance... brb ... !