icloud security breach - keep getting "subscribed to “ap ua gosd”" type messages

So, my icloud account was hacked yesterday.

I received the email"Your Apple ID (XXX ) was used to sign in to iCloud on an iPhone 5s."

I don't own an iPhone and never sign in the the iCloud.

So, I logged in to my account on my mac, and could see a couple of connected devices that weren't mine.

I removed these accounts, immediately changed my password and set up 2-step verification.

However, now I keep getting emails that saying that invitations to a shared album have been accepted.

This is an album that I hadn't created.

For example:

"**** subscribed to “ap ua gosd”The invitation sent to **** was accepted by ****@qq.com.

If you did not intend to invite this person, you can remove them from your shared album."

However, I cannot see this shared album anywhere, when I log in to my icloud account.

Should I be alarmed by these emails, and is there anywhere else that this newly created album (presumably created by the hackers) could be stored?

[Personal Information Edited by Moderator]