Blue valley spar are terrible and do underhand things

Went to blue valley spar for the Promotion of the master chef pots and pans, I called the store manager an hour before going to enquire if they had stock of the master chef casserole.The manger informed me he had stock, when I arrived at the till to redeem my 6 booklets I had all adding to R10000 the cashier pulled out couple sheets of paper checking for my name I informed her I spoke to the manger a d was shocked to see her looking at a paper for my name as this was promotional items suppose to be displayed in front of store for you to pick what pot or pan you wanted and redeemed.. the cashier informed me my name is not on the list so she cannot give me a anything I asked for the manage he came out & stated he will check at the back for stock after waiting several minutes he cane back out to say he got no stock I was so upset & stated i just saw the cashiers giving out the casseroles to people whose names were on a page,he then stated yes we do have stock at the back but they are reserved for people who called and Gave their names.. this is totally unfair and unacceptable as these are promotional items and I spent over R10000 trying to redeem my books for pots I wanted a 2days before the portion ends only to be told this store does under hand things ad no other spar hides stock in the back and makes people write their name to reserve stock.. this blue valley spar should be investigated as they do not practice properly as other spars and refuse customers of the Promotion items which they have stock of due to them having under hand dealings