Smartpay I feel that I am being charged way to much for a GalaxyS7 Edge cell phone.  Internet

I had been paying for a Galaxy S7 edge every two weeks since April of 2017,  bringing the total to $2,467.04 and they are saying as of Feb.2018 that I still owe them $323.90 which would bring the total to $2,790.94, which I feel is a big ripoff and way too much to pay for a Samsung Galaxy S7 Edge cell phone.  I need to get out of this bad gone way wrong ripoff deal.  Can you tell me how to get out of this mess.  

                                                                                                                                                Thank you; 

                                                                                                                                             Syrinthia Marsh

   P.S.  I hope to hear back from you soon.