My experience sounds a lot like others here. The staff seem to have two default lines:
1) Oh, our store didn't receive any stock. Perhaps try again later in the week or early next week - you could try ringing up first. Sorry, what was that? No there won't be any stock out the back.
2.) Oh, we sold out of that item in the first ten minutes, it was very popular! Perhaps try again later in the week or early next week...(finishes same as first line).
And if one doesn't work try the other. If both don't work, plead ignorance and put customer on hold or go for extended tea break!
You get the picture! Sounds like lots of people have experienced the same picture!
After ringing the first couple of stores I gave up on actually finding Devy, and instead just asked as an experiment. I got the same reaction at all 5 of the stores I called - and I was even using my "nice" phone voice!