I bought a phone in Phones4U a short while ago, but had nothing but issues with it. Every time i tried to text, the wrong characters were appearing and then it would just shut off. After 2 weeks, i gave up and went back to shop to get it replaced or get a refund (still had receipt and everything)...I took my DS in the buggy in with me, it was pouring outside, so i was wearing an anorak which makes me look very sophisticated 
, and i had no make-up on. In short, i looked a mess - anyway, i trundled up to the young sales assistant (couldn't have been anymore than about 20) and asked him to replace / refund phone. He took phone off me and started playing around with it, asking me what the problem was..i explained, to which he replied "Don't confuse the phone not working with you just not being able to work it"...I was 
at this, as obviously he had taken one look at me and jumped to conclusions based on my appearance. I was going to start a big tirade on how my technical degree should mean i am able to work a bloody mobile phone, but i was so angry that i told him i thought he was being arrogant & condascending, to which he smiled. Left before i smacked him in the chops!