How to unlock User1 from a used Macbook Pro?

I recently purchased my 2013 MacBook Pro  from an owner who had it for only four months.( He gave me his receipt .) I am trying to install new software like Microsoft and I am receiving a message saying I need the password for User1. I never set up User1. I tried to change the password in settings but it wants the old password to do this. Of course i don't know it. i tried to contact the seller, but he is not retuning my call. Is there anything I can do?

Re-install the OS as the seller should have done.
Reinstall on a used Mac        see post by  Linc Davis

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