Main box OK, others not working

Everything was working perfectly.  I had an extra box that I needed to turn in, so I brought it to the office.  The Xfinity person suggested that I needed to bring in all of the boxes to swap them for new ones.  I made another trip to do that.  Got everything home, and nothing worked.  No TV on the primary box, nothing.  One of the new secondary boxes was completely dead - No power light, nothing.  I brought that back, and another person swapped that for a different one.  Then he looked at the account, and the prior person hadn't set up the primary box as primary.  Then he gave me a new primary box.  He also removed the box that I returned from the account, which the other guy didn't do, meaning that I was still paying for a box I had turned in.  I installed everything, and after a considerable amount of time, I got the primary to work.  Days later, the secondary boxes still won't connect.  What next?   RDK-03053 is the current error message.