Nebula - I didn't sign up or download the app and I'm getting charged

One day these payments just started appearing on my card - never heard of Nebula before then How do I stop the payments - I don't have an account to cancel and don't want to give them more of my details because clearly they aren't a legit business no contact details or business page just a random support@nebulahoroscope.com with address in Cyprus "62 Athalassas Avenue, Mezzanine Floor, Strovolos, 2012 Nicosia, Cyprus" reported them to Scamwatch in Australia and ACCC but given international business assume that won't help