US Immigration from Slovakia

I got into a funny situation. Got to the US with K1, applied for AOS in Pennsylvania, went to biometrics there and moved to Washington . Changed my address with USCIS and got confirmation both in email and in new physical address in Seattle. Changed address again (different apartment in the same building) and got another confirmation - again both in mail and email. 5-6 Weeks after that I saw an email that my interview was scheduled, hooray. A couple days ago my sister in law sends me a screenshot of my interview appointment notice - delivered to Pennsylvania, scheduled in Buffalo. Thank you USCIS you've OUTDONE yourself. Again. Called their support line, asked about rescheduling and they were not able to tell me when is the next available date for interview in Seattle and there's no way how I or they can contact that office. Based on what I read online the rescheduling usually takes 1-3 months.

The question - suck it up, pay 1300$+ for flights and hotel for my wife, make take PTO just because of USCIS fault and possible be done with this hell of a process ... or risk waiting another x months stuck in limbo?

Anyone having an interview / knowing anything about Seattle office dates?

Thanks

Is anybody whose PD is 2017 still waiting for an interview in NYC to be scheduled ? MY PD is December 2017 and the wait for this area is insane.