We have just received 3000$ from Telegram and decided to donate all of the money to the Mahak charity’s representative in Germany.
It was mentioned to the Telegram team, that the amount of money they paid was almost nothing comparing to the severity of the bugs.
The full documentation about the bugs would be published as soon as the patches take effect.
http://www.theregister.co.uk/2016/06/14/telegram_crammed_hackers_find_way_to_send_massive_messages/
***Update***
Some of the bugs have been patched: