Family Sharing Hacked?

I discovered this problem when I was unable to download a few apps on my iPhone. I received the pop up saying that there is a billing problem with a family members previous purchase and to ask the family organizer to update their billing information. I have never set up family sharing or granted access to join one. I then noticed that an unfamiliar ID (in Chinese) was being used to manage family sharing for my account. Also about a week ago, I was notified that my Apple account was used to purchase two $15 iTunes gift cards which I did not purchase or authorize. I was not given the option to refute these charges as normally done for any other iTunes purchase. I immediately changed my password. I then tried to leave whatever family sharing group i was unknowingly apart of I click the 'set up family sharing' link on my iPhone. Then i receive a pop up saying that I can not start family sharing because my account is already being used to share purchases by another family listed in Chinese. Has my account been hacked?