Could you please add us (email@example.com) as collaborator into your application, It will help us to provide better support to you from our end.
For adding us as a collaborator please follow the below steps:
App42 Cloud API->AppManager->Collaborator->Add Collaborator->Enter above mentioned emailId and submit
Also, please share the AppName, game name and ScoreId which you have to delete from the leaderbord, we will delete those records from the backend.
Going forward in the case if you have to save the leaderboard of non -english character, You can use the Base 64 Encode and Decode technique, where you have to encode your Non-English character before you are going to create the leaderboard, fetching this record back you have to decode back this encoded data. This is directly supported by our SDK.
For getting more detail please have a look at 10th point in this link.