If you did not delete your characters, I would suggest changing your login credentials, as someone with access to your account did so. It wasn't Bungie.
Characters can only manually be deleted from within the game on the character select screen. The API is reporting that your characters were indeed deleted and not just missing, so someone logged in using your account, and deleted your characters. The reason you have an intro class there is because you cannot delete the last character, so the person had to create that character in order to delete your last normal character.
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Thank you. You explained it. I guess I lost a friend. And lot of my money and time spent. I probably won’t even play games ever again or be able to trust people because this has happened to me too many times in multiple games and real like situations. People just use me for what I have and then when they don’t get their way they just sneak and ruin your stuff, just because I was playing Destiny more than other games:(