If you play a wrong song (Ex: song name is Death Bed but it is playing Counting Star song when you play), steps to resolve it:
Step 1: Report the bug to development team, write it on google play or appstoreGoogle Play or App Store
Step 2: Wait a new update version for bug fixing
Step 3: Update lastest version
Step 4: Execute steps in images below:
❗Important: For the purpose of fixing bug, you'll not have to watch ads again to unlock the song you've already unlocked!