Doctor did not listen to me

My pediatrician asked if I wanted the flu shot for my 6 month old baby. I said NO. So she said ok but she explained why she recommended it. When she got done explaining I NEVER told her YES. So she left the room and the nurses came back with the initial vaccines that I was actually there for. When they got done vaccinating my baby one of the nurses told me that since my baby got the flu shot I had to bring her back in a month for a “booster” shot which is a second shot. I was soooooo angry. I dont know what to do.