RealtyStore.com posing credit card charges after cancellation by changing merchant names Goleta California

I used realtystore.com online service for 1 day last October as they advertised that the first 7 days were free.  They charged me $1 for the first month, and started charging $49.6 in the following month.  I was surprised when I got my first bill with "Natinfo*realtystore.com" and I called the number and immediately canceled the service.  However they continued the monthly charges by using different merchant names so that it was not easily identifiable.  They used "NIC" or "RTS" in front of "realtystore" or simply "realtystore.com" in these charges, which lasted 12 more months until I detected that they are all from the service that I canceled a year ago.  I thought the cancelation was long taken care off and did not pay close attention as I did have some other real estate related services to pay for.  It turned out that all these charges were from Realtystore.com.  I believe this constitutes business fraud and hope they can be fined and regulated. I would also like to seek advice on if possibility of class action suit is feasible as I saw multiple complaints online about their fraudulent practices.