1st) Make 100% sure you have updated to the latest iOS or Android wallet.
2nd) Make sure you leave the app open so it can fully sync. Could take 10 - 50 minutes depending on the random node you connect to first and your internet connection.
3rd) If all else fells you can use digisweep but everyone we have helped has gotten the issue successfully fixed after the latest update.
DigiSweep:
https://digisweep.digibyteservers.io/Or to run the code yourself:
https://github.com/DigiByte-Core/DigiSweep Thanks so much. The first 2 options did not work for me, but it did for option 3. I now have all of my DGB back. Whew! Thanks again.