You will want to follow the instructions here.
I ordered three new XPS desktops to upgrade  my families (the kids high school and middle school) computers.  The order process was fine, delivery was fine, set up had issues.  It seems the windows 10 keys are all in use and I need new keys to actually activate windows. I tried to chat with a rep.  Chat was unavailable even though it was during the stated hours for chat support.  So I called.  I was on hold for a while and then I got transferred to software and was on hold for a while longer they transferred me to hardware.  I was on hold again and got transferred back to software.  The next rep had an accent so thick I couldn't understand him and he hung up on me.  I never got called back.  This was over 90 minutes tying to get help. So I send in an email ticket.  Two days go by and no response.  So I try to amend my ticket or update it and I cant.  So I submit a new ticket.  Another day passes.  None of the tickets are even looked at. At this point I am done and want to send everything back for full credit.  I will give Lenovo all of my business from now on. Patrick Wheelon
How do I send back my computers?