I use several Telegram accounts pretty actively for work. That's for talking with clients and sending out news about my company's promotions. And yeah, I'll be honest, the accounts are ones I bought. But I've had them for over a year now and they worked fine. Today I can't log into two of them, it says they're banned. What could get them banned and what can I do about it?

There's always some risk when you buy accounts instead of registering them yourself, you never really know how many people used that same number or profile before you did. Doesn't mean it's guaranteed to happen, plenty of people run bought accounts for ages without issues. But when it goes wrong, it's usually not one single mistake, more like a bunch of small things stacking up until Telegram's system decides something's off.

Could be a bunch of things honestly, sending too many messages in a short window, joining a pile of groups back to back, or running multiple accounts from the same device or IP. That last one's rough too, if one account gets flagged, Telegram can drag down every other account tied to the same setup even if they were behaving fine. There's a rundown on what to do when your Telegram account gets banned here: https://gologin.com/blog/telegram-account-banned/ . It walks through messaging their SpamBot first to figure out what kind of restriction you're dealing with, then sending an appeal email if that doesn't clear things up. Some ban types are basically impossible to reverse once they hit, so knowing which one you've got matters a lot.