Bhs
Bought an own-brand kettle there, which after a fortnight began to leak water from the electric switch, the button you push down to switch it on
Didn't have the receipt by then, but took it back, it was Bhs brand and still on sale there, and I just wanted a replacement
Me: I bought this 2 weeks ago, leaks water from the switch, can I exchange please?
Her: Hmm. No receipt?
Me:No, sorry. But own brand, still on sale, DANGEROUS, yadda yadda
Her: (looking inside it) Are you sure you've only had it 2 weeks? (sceptically)
Me: er, yes, and out of interest, after what amount of time would it be acceptable for an electric kettle to leak water from the switch?
Her: well I will exchange it, but next time you must bring your receipt
Me: don't worry, I think it's very unlikely that there'll be a next time!
In the same branch the assistant gave my sister change for £10 rather than 20, refused to believe her and said she'd have to come back into the shop the next day after they'd cashed up the till and if they were £10 over, she could have it back.
My poor sister, heavily pregnant, who knew she was right because that £20 was all she had to last her the week, had to take a £3 return bus journey the next day, and the assistant said 'Yes, it was £10 over' and threw her the money without any apology.
This is bad practice