First of all, you do know these are grotesquely ugly right? And it will not EVER bloom blue again? These are honestly horrid abominations.
It sounds as if you have been watering from the top? And have got water in the crown (where the leaves all appear from). This is a death sentence for phals, because the water will sit there and fungi and whatnot will attack the drowned parts of the plant (meaning the crown with the water in it). This causes the leaves to slowly drop off, and the stem to go all mushy. Yum! Pretty much, there is nothing you can do to save it, apart from buy another one!
But it sounds as if the staff at the store caused this, especially if you have only had it a couple of days.
Hope this helps, Cheers!
PS/ it looks as if it never had leaves....thats one sick plant