diff prices in diff stores?

not using your customer services platform because that in itself is copy and paste and you never get feedback so waste of time. I went to glenvista yesterday bought various items which were priced wrong went back and showed manager. Today went to other woolworths stores - same items all priced higher so what is it then? R25 for chicken strips of R20 - the mixed berry rolls were 3 for R15 yesterday today they are buy 2 get 3rd for R40 - I dont understand?? and dont send me stupid store surveys if you arent going to fix the pricing problems I am always highlighting!!!