There is no way to correct for elevation. That is configured when you create the station ID. Same goes for location. If you need to change any of that it requires creating a new station ID. Now it is maybe possible that WU can fix that for you but I haven't read evidence that this has been done (but I obviously can't know of every possible circumstance). Usually people just create a new station ID.
The problem seems twofold. Previously you were able to enter the elevation manually when creating a station. Now it seems that they have taken that functionality away and the elevation is set by the map only. The other problem is location using only 3 decimal degrees. At least that you can fix by manually adding the added decimal degree digits (I suggest 6 decimals digits).