Bad attitude and even worse service from staff

on saturday (21/02/2015) we walked passed best electric with no intention on visiting the shop until the one staff member told us about the special that they would be having! we went into the shop and i saw a slow cooker that i wanted and she said the special only starts monday (today) and they open at 7:45. when i arrived at about 7:35 i saw them taking 3 or 4 snackwhich makers to the back aswell as the two slow cookers that were on the one cupboard. when we entered i asked her can i have a slow cookers and the branch manager lady had the audacity to lie to me and tell me it's out of stock whilst me and 3 other clients saw them taking it to the back perhaps for their personal use. isn't a special like this supposed to attract people instead of chasing them away with a branch manager that challenges a client when telling them that im going to report it? Can't i then report this as misleading or false advertising? I specifically asked the lady how many slow cookers they have left and she said 4.And then she tell sus that they are doing us a favour opening at 7:45 but what favour if they take all the stock to the back of their offices.