It often happens that telegram blocks accounts without warning, even those accounts that have not been used after purchase. Contact your account provider, they are obliged to replace them under warranty. If you use accounts for inviting, make sure to use dynamic mobile proxies or dynamic resident proxies (it is important that the proxy is dynamic, not static).
Telegram also very often blocks accounts from Asian countries, accounts from India are also considered to be of low quality and are often blocked.
What conclusion can we draw ?
1. Don't buy the cheapest accounts from India, China, Nigeria, etc . Telegram often blocks such accounts for no reason even if they were not used .
2. Use dynamic mobile or resident proxies.