Nikon d5200 digital retailer camera

Product Name: Nikon d5200 digital retailer camera
Nikon d5200 digital camera Includes camera, lense, strap, charger with 2 batteries & microphone The camera itself it fine & works & takes photos, however it was dropped & the part of the lense that connects to the camera I think a piece has come off the edge which causes the lense to easily disconnect. I try to show it on the 2nd & 3rd photos. So you can repair the lense if you know how or just get a replacement lense. The microphone is not Nikon but works with this retailer camera & has never even been used.