Change telegram bot owner
One of possible solutions (most simple as I wonder) is in the creation a new bot with same username. So only need to delete your old bot, create new and change bot token in your program code.
Note that it's possible only if the old bot's owner collaborates. To prevent similar situations your company need to create one telegram account for creating bots, channels etc., without ties to concrete persons.
UPD 2020
Telegram teem finally did the trick and added the changing ownership feature. Bingo. But this will not help if you can't ping an owner, same.
Recently, the function of transferring the bot to another person appeared.
