Thanks for posting. You may not have been hacked. Frequently spammers may spoof or fake a real email address on their junk mail. Unfortunately the response comes back to you. This happens on cell phones, too. I'll get a call or message, and if I return it, the real owner knows nothing about it.
While this type of behavior is certainly shady, it is a fact of technology today. The good news is that our 24/7 Support can show you ways to protect yourself. --Contact them.
I hope that helps,
Thomas D. - GoDaddy | Community Moderator 24/7 support available at x.co/247support