If users report unwanted messages from your account, it may become limited by our anti-spam systems.
While limited, you can always message your mutual contacts and reply to anyone who messages you first. But you can't start a chat with people who do not have your number in their device contacts – and in some cases you won't be able to send messages to public groups.
To learn why this might happen, or to report incorrectly applied limitations, please contact t.me/spambot.
You can also find more information here: https://telegram.org/faq_spam