FaceTime hacked

I received a FaceTime call today mob my iPhone 6 from my own contact ( my ptofile picture, my numbe, my email, my contact card) as this was very strange I answered and a stranger was on the other end when it connected. I hung up quickly as j was scared. I changed my apple password, as per advice from other threads. I received another call from my contact again, 9 hrs later. No other device, email or mob has been added to my account, no notificatiins have been sent. I have turn off FaceTime for now. I don't know how this is happening or who to ask for help, Any advice is much appreciated