This just happened to me. My town was gone for a whole week, during the end of the halloween event. So I missed out on a week's worth of GOO and therefore some of the final personal prizes. EA didn't care.
But basically, the only fix is to contact EA Help and have them sort it out. They will, but the process will be slow and you will only receive two gold scratchies for your inconvenience, not anything that you would have missed out on while you're game was not working.
My town has been reset from level 35 to the very early levels. I'm not level 1, but I've lost months of progress including the money I spent on donuts. My town is very small but I have a few buildings. This worries me more than if I were simply reset. Should I contact Apple for a refund?
If this is how these guys so things I would rather not waste my time with this game anymore.
Playing - GTA 5, Lego Marvel, Deadpool, Marvel Heroes (UP), Dragon's Crown, The Last of Us