Not able to leave beta

Few days back I joined beta version of Discord. Satisfied as the app started malfunctioning so decided to leave the beta version and hence went through they instruction. But even after uninstalling and reinstalling the app for more than five times I am still not able to leave beta. I'm really disappointed with the apps behaviour and want to leave the beta version as soon as possible. Even complaint at the Play Store but my problem is not yet solved.