Special is not special at the till

This is merely the latest in a long line of complaints about Picknpay.There are two main scenarios they use and this happens so often that I am now assuming that it is a deliberate **** to hoodwink the public and maximise profits. Firstly they advertise specials.You arrive at the store at opening time on specials day to find they are"Sold Out" and no one knows when they will get stock! Really?/ Sold out in the first f ive minutes of the store opening. Secondly the tills are not set to charge the correct price.In the often rush of checkout this is not noticed until you get home and on phoning the store they are "very apologetic" and you spend time and fuel to get a small refund. If you have a place I can send the adverti*****t and the till slip scans to I will send. It is easy to see that they rely on clients not noticing that the wrong price has been charged,Happens far to often to be a coincidence