F2 visa rejected

Hello Sir,
My wife went to us on 5th of may on f1. I applied for f2 and got rejected. Only 1 question what I was concerning is visa officer asked me,he had asked my wife “is your husband joining with you” she had thought wether he is asking her i’m joining along with her when she is going to us and she has said no. So the VO raised that question against me and I said no, she would have definetly not said like that because we already planned that I’ll be joining her later. How can I overcome this issue. I needs more details on documentation. Do I need to submitt any bank balance of mine or properties. I was issued a refusing letter on 214b and said your visa has been refused. Sir can you please help me on this.