Issue symptoms
I am being attacked by Chinese spam generated by qq.com users. What can I do?
Resolution steps
Prevent that domain from creating tickets. Use the blocklist from the Admin Center > People > End users.
Add the following entry to your blocklist: reject:qq.com and save the page.
You can also enable enhanced user authentication if you do not have this setting turned on.
Note: In case the above information doesn't help, verify the ticket channel. Then, verify these articles: Resources for preventing and managing spam and How can I combat spam submitted via web service?