here's my advice. ALL SHOPKEEPERS ARE BASTARDS! i don't blame them, there's not too much money in it anymore. and the rents for most of these shops have skyrocketed in the last 4-5 years. it's really hard to make ends meet.
if you're talking about the shop downstairs where psclub is, but nearer to hkb then to al-fatah, then yes, he's no exception. i mean, you have to save your own ass. this friend of mine bought an xbox from him, and he gave him fake controllers with it. there's also something wrong with the xbox, and he's giving that friend of mine smart-ass comments about how it's either his new tv or the wire he's using. i'll be going there to set him straight not too long from now.
but then i'm gonna have stories like this about every shop i've ever been to. i mean, seriously, if you come to think about it they have to pay a 20k (at LEAST) rent plus salaries for their salesmen. how honest do you want them to be?
make sure everything is in perfect working condition before you take it out of the shop. and also discuss things on the forum; that's what they are here for!
now, what exact masla are you having with this dude?