@Roberta ************
, something isn't right then :/
As long as you've filed a TM.30 (stating you now live IN Bangkok), have been doing your 90 day reporting at Chaengwattana, meet the financial requirements, and turn in the correct documentation you should be able to apply for your yearly extension at that office.
I mean you're NOT the first foreigner to move to bangkok from another province on an existing extension which you got in the province you used to live in.
When does your current extension expire?