Did they include your original copyright notice? If so, they're free to change the branding, name, contact information and so on - they simply forked your project.
That is way too hostile for a first contact. It would be much better, at first, to politely ask them to comply with the license. If they ignore you, or refuse, then think about escalating.
Based on the commits, PRs, and issue history, they were all previous issues that exists in OasysDB. They changed the name of the contributors to their own.