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You have to delete your current telegram account to remove bans ( dont worry u can use your phone-number again )
- Visit the official telegram site to find the delete - Link "https://my.telegram.org/auth?to=deactivate"
- Enter your phone number
- They will send you now a message on telegram with a code
- Enter this code
- Close the current site
- Open the link again ( https://my.telegram.org/auth?to=deactivate ) - enter a reason why u want to delete yr account.
- Start telegram on your Smartphone and create a new account.
Kind regards 