Hi
I disagree with this.
I bought my Denon X3800H from a PTC retailer in Rohtak (Haryana). I required service for the same recently (in-warranty) in Mumbai. Both the PTC number mentioned on the box & the retailer gave me the contact details of the same service center in Mumbai. Though the service was carry-in, I faced no other issues with claiming warranty.
Though I still believe that selling practices for both Denon importers (PTC & ProFX) are shady at best, I do not believe in this PTC vs ProFX argument.