Obnoxious and unhelpful staff

On 20 November, I tried to return a kitchen knife, purchased at PnP Hyper Brackenfell, about 2 weeks earlier. There was nobody at the Returns counter and I was directed to 'Jonathan' .... who demanded my receipt. The receipt had been discarded and I didn't think I needed it as the PnP staff had previously found the transaction on their system, to process a return. Jonathan was clearly not going to be helpful, so I left the knife in his hands, took a photo ... and walked out. Jonathan didn't seem to like my taking his photo and took out his mobile to chase after me for a photo, saying: "Well if you want to take photos without asking, so can I". I found that rather amusing since we're in a public area of the mall; and wonder if that is official PnP policy, or whether Jonathan was making it up. In any case, PnP have closed circuit TV which watches customers all the time .... and they don't exactly ask, do they?