Promotion Products "Out of Stock"

Click recently advertised ArthroChoice Joint Support Tablets 120 at a promotion price online. They ran out of stock one week before the promotion ended. Stock was available in store but at the normal price. One week after the promotion finished stock was once again available BUT at the normal price. When asked to honour the promotion price Clicks hid behind T&C's This is not the first time advertised products are not available for the promotion period at Clicks. Why do Clicks not put the interests of their customers ahead of hiding behind T&C's? Other major retailers honour prices should they run out of stock! Why don't Clicks.