I hope you took it up with the manager, that's appalling!
With regards the small animal care, it seems it's a nationwide problem, as I'm not the only person (by a long shot) to have noticed it - if you go on many rat/rodent boards you're bound to find someone whinging about them. Their track record, all over the country (I'm not saying all stores but certainly a large amount!), is pathetic.
Taken from their website:
"Perhaps the most suitable type of enclosure is either a large wire multi level cage or an aquarium with a well ventilated and secure lid as rats are extremely agile and can jump up to two feet or more! The minimum size cage for one rat is 60cm x 37cm x 22cm."
Firstly, rats shouldn't be kept in aquariums as the ammonia build up affects their respiratory systems, and they need to climb. Secondly rats are not animals to be kept singularly.
Now you might think "Why's she wittering on about rats on a fish board?" and my point is this. While it's fair enough for them to blame their bad advice on untrained staff - they have had people contact them with the correct info and have refused to hand it out! The last time I was on a rodent board was over a year ago, and for months people had been campaigning for them to change their info - even offering to do correct care sheets for them. If they're still saying the wrong info on their site, does it really sound like the top dogs there care? Could be a fish, a bird, a hamster, a rabbit - they just dont want to learn the correct way to care for the animals they sell.