Security guard pushing me at front door

I went to Game stores to purchase an iron and when I got to the door the security refused me.entrance as she felt like I was late.i asked to speak to the manager as I wanted to explain that I had a back surgery and hence I was walking slowly to get to the store.while speaking to the security ladies I calmly asked for the manager and the security lady refuse.i then proceeded to lightly tap on the door and again asked for the Manger which again she refused and them responded she is going to call the manager which she left for a second and came back telling me I have to call the store via telephone I then asked her if I can Come into the store and she closed the door I then politely asked her what her me was as I explained she does not work for game but the security company and then she pushed me away from the door bearing in mind I had a back procedure on Thursday and proceeded to closed the door in my face.in the interim a game employee came passed and I explained and he allowed me.in I am livid as I could have hurt myself and who was going to cover the costs.i proceeded yo ask gor the manager and with the red hair and she said she was buy with a customer I then went to customer service which pointed me into the direction of another person who took me details.im utterly disgusted in the whole situation as I was not well.and another human being had the guts to push me