qq.com address what does that mean ?

Walked into the Apple store with my iPhone that I purchased from the Apple store two years ago to get the battery replaced. The Apple rep asked me to punch in my phone number in a search box on this iPad and out popped my account and several others with qq.com email addresses and Chinese names. I was baffled and asked the rep why so many Chinese accounts showed up against my phone number. He answered by saying it’s a database error. I Amin doubt now. I did see others in the list that I recognized that were associated to my daughters phones which makes sense because my number was used previously on other devices that they carried before. So why does my number bring up unknown email addresses. That’s scary since iMessages work with both phone numbers and emails and forward the messages for emails to the rightful devices by pulling up the corresponding phone numbers or vice versa. It almost seems like my iMessages may be peeked by individuals holding these qq accounts. This is speculation, however the fact that folks in China are associated to my account is unnerving.

i would like Apple support to explain what’s happening here?