Hi,
Sorry to hear you’ve had this problem. Unfortunately there is no way to restore your progress, nor any cheats be can provide you with to accelerate your progress. This is the only report of this problem we have had, and we have tested call interruptions with no problems, so I am not sure what happened to you. I realise this isn’t quite the help that you would have liked but there is nothing further we can do to help you.
In future you could manually back up your save files (stored in your games directory under the OEAppSaveData folder) in case something like this happens again.
.