Amazon Prime — same charge on several recent credit card

My last 3 credit card bills (Dec. 16-jan. 15, 2019, jan. 16-feb.15, 2019, and feb. 16-march 15, 2019) have had a charge of $14.03 on each bill. I haven't bought anything from amazon recently and have never signed up for amazon prime. Is there a monthly fee for this service? I wish to be taken off your prime list since i never signed and will no longer pay this monthly fee that keeps coming on my credit card bill! Please inform me of my next step in stopping this transaction. Will be waiting to hear from you at ppalomba5555gmail.com.

Thank you
Annamarie palombaro