frustrating....

When I have all my deals planned out and coupons ready and sales papers in hand, frustration sets in when my product is sold out at a particular store, a cashier decides to change the way a store has been doing business, or when a deal gets messed up somehow. I definitely haven't mastered the art of couponing yet, as the last few days of shopping have shown me. I forget that when doing a deal with RR or EB that you have to do 2 separate transactions to get your RR or EB back more than once. (messed that up today) And the cashier would not void/refund the transaction so I could ring it up in a new transaction (Grrrr, he said he could do it but the coupon had already been used and he could not use it again, whatever) I haven't mastered telling stores about their own coupon policies when they mess it up, because I;m just not that knowledgeable about it yet.