Annoyed

On Sunday mid day went exchange 2 pairs of shoes, cashier was full of bad attitude she asked for my ID number when I ask why would she want my ID number she frowned and said for the rewards, I honestly feel that they should firstly explain about this Rewards thing before asking for ID numbers and they should not frown at us if we don't wanna give ID numbers to them.... She made feel it's must to give her my personal ID number