door mechansim

Help needed in finding door handle replacement (exact) if possible. I am looking for a replacement door handle like the one in my picture if possible. It also needs to have the door mechanism with it. Does anyone have any idea where i can get one? Thanks

Our UPVC front door (with multipoint looking) dropped away from the hinges such that it is very difficult to lock it. When pulling up the door handle there is some resistance, but it goes in the right position with some force. However, then there is also some resistance when turning the key...