I order a lot from John Lewis on line, & collect from my local Waitrose (no JL dept store near me). All usually with no problems.
However I sent back some items to them 10 days ago via Royal Mail. The parcel has not yet arrived - likely it has been lost. This has only happened to me once before, with a smaller retailer, and when I phoned, they refunded me straightaway - all I had to do was to send them the postage receipt so they could claim back from Royal Mail.
However John Lewis have told me it's not their problem; they won't refund; I have to take it up with Royal Mail. Why should this be my problem, when I have returned stuff to them the way they say I should? At the moment I'm £77 down 
I'm seriously pissed off. AIBU to have expected a retailer with John Lewis' reputation to have handled this differently?!?!!