I was charged twice on my Discover Charge $49.99

On my Discover Charge on7/31/18 and 8/6/18 I was charged for the same thing "Dri*AVAST Software" priced at $49.99. I would appreciate getting a refund for one charge as soon s possible.
Eileen Hogan   6914 Courtney Lee Ct. St. Louis, MO 63123     314-282-0787