Steps to Leave Multiple Telegram Groups and Channels.
Ensure that you're as of now signed in on Telegram prior to proceeding. You will receive a confirmation code to your account and not SMS.
Telegram might caution “If you delete your account now, it may not be possible to sign up again for several days.“ You can actually join again immediately after deleting your account.
Now, open Chattitude and sign up again to continue using Telegram.
Or you can try out this method in the video below: