help~~how to exchange a pack of diaper after i use the coupon?

[ilovetoronto]

dear all
i purchased two pack of diapers in RCSS using their in-store coupon which is $9 off. (that was the last coupon left on the coupon zone, i was lucky) i asked my DH to pick one pack of size 1 and one pack of size 2. however, when i got home, i found he took two packs of size 2.....now i want to go back to the store to exchange for one pack of size 1 as they are at the same price ($16.95 each).
the problem i am thinking is will they just do the simple exchange for me? or will they consider i used the coupon before and give me hard time? because i cannot find one more coupon, otherwise i can return them all and re-purchase them.

thanks

[bricon1621]

you shouldnt have any troubles at all since you are exchanging only...

[Chuck71]

As long as you have your receipt you will have no problems in just exchaning sizes

[amanda4]

I have exchanged using a coupon in original purchase. No problem .The problem would come in for a return