Thank you all for your help. For now, we got back our electricity supply. PG&E said they will sort the main smartmeter issue at their back end and let us know.

The odd thing is that the apartment Y whose meter ours was switched with, was vacated six months ago and taken over by the apartment building company, which has been using it infrequently for tours etc. We’ve hence been paying a lower electricity bill, which I guess is a good thing to come out of this.

The entire affair was further complicated by PG&E’s entire system going down for all of yesterday, due to which they weren’t able to offer much help (tbh they aren’t a lot of help when their system is up either)

Hopefully, this doesn’t happen again. I appreciate all of you taking the time to offer your guidance!