If I can advise you please jump to page #807 of this forum and read making-blood-run-cold story of UsBourkes, who - as you - lost his city and somehow forced GI to restore his city back (positive solution is on page #832). Maybe you'll find any clue?
@ Bernardngo: Welcome back!
Hmm...I wonder if someone else is currently running my city. I keep bugging GI, filing tickets but we will see.