I can sympathize with you. My house address (on my tax bill) is Zero but Enhanced 911 can't do a 0 so the town is now calling me 2A. We have the 0 posted on our house and a sheet with 2A on the front door just to the right of it. The post office has figured it out - I think there's a note in the back somewhere.
Other delivery services (FedEx, UPS) don't recognize 0 so I have to use 2A and our packages often get delivered next door at #2 until the driver learns the difference. Fortunately, we get along with the neighbors.