Think a lot of people would say nothing tbh, don't think I would have posted in here for a while either and kept it to myself, and friends.
It's their error stuff em.
I once ended up with two monitors and two graphics cards. This was when monitors were CRTs.
I didn't get my delivery, the depot had been burgled apparently. When they sorted everything out and my delivery eventually arrived, there were two of each thing. The driver said the original items must have been in the van when the depot got burgled.
The company I bought the stuff from did call me about arranging collection but they never did collect them.