CRYDROS, Duplicating contacts is no fun. We'll help get this resolved, but first tell us some background information. When did this start? What recent changes have you made on your phone (apps, software updates)? Are you using Verizon Cloud?
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I've experienced this many times in the past. Essentially, in my situation, what appears to be happening is contacts are entered into multiple cloud sites....such as Verizon Wireless, Microsoft and/or Google. If the different sites try to update each other when the data fields do not perfectly match, a new entry will be created.
My workaround is to keep separate databases. I use the Verizon Wireless cloud for my Samsung Galaxy S7 Edge, and, Microsoft One Drive for both of my Microsoft Surface 2-in-1s.