Mandarin orange plant

Due to the weather, this has now, been moved inside.

I have placed it upstairs in an empty unheated room that has a south facing window, where hopefully it can get the light it requires. It really looks nothing like the plant I purchased, It's lost a lot of leaves and all the small fruit.I am hoping to get it through the winter without any more damage. With a bit of luck it will return and flourish. Hey ho a bit of optimism goes a long way.