I bought a used zs tdci from tc Harrison.
after a couple of weeks I noticed that the rear screen and one rear window were privacy glass and the other rear window was a normal tint (Don't know how I missed it)
I rang them up and they arranged to have it changed. They reckoned it may have been built like it
The windows are bonded in so they had it for a few hours while the adhesive went off properly
I would insist on replacing the glass