Hello, sorry for your issue. If you're playing on Android, and don't use the cloud save system, you have to follow the instructions displayed when you download an update: 

Installation instructions

Android (how to keep your save file)

• About the Android version, unfortunately, the fix we had made to make sure the update would work isn't working for everybody. 
• So to make sure you keep you save file, you'll have to manually backup it. 
• To do that, you'll have to use a file explorer, and find your saves in /Android/data/com.GrizzlyGamer.RMAWhellcum 
• Copy everything that's in there and paste it somewhere else, In your download folder for exemple. 
• Uninstall the game, and install the update. 
• Now you can copy all the files you backuped earlier, and copy them in the save folder: /Android/data/com.GrizzlyGamer.RMAWhellcum

If you haven't, then I'm sorry but there is nothing we can do. We implemented the cloud save in january to prevent that kind of situation.