I'd tell Children's Place corporate.
Last summer, we had a LOT going on so I ordered my sister's baby shower items online from Party City to get them on time.
I got them and found out that BIL had booked a venue that gave us plates, napkins, etc. and I only really needed plates and napkins for the cake. Their written policy online was that any item could be returned to any store, except the online only items. My items were not marked online only. I packed up everything with receipt and took it to a local store, figuring I could exchange for my DD's birthday stuff. They were still going to get my business.
It was a horrible experience! The items were not carried in all stores and basically I was told they "had no need" for that theme and didn't carry it, so I was out of luck. The sullen cashier called over the manager and they acted like they'd never done an online to store return before. I would have done better with a box of snakes.
I decided not to waste my time (and my daughter's - bless her, when I told her I couldn't get her stuff that day she said, "That's OK, Mommy.") and called the next store. They were better, but really confused at the SKU I gave them and didn't carry it, either.
I copied the statement from the website and sent corporate a firmly worded email about the experience. I got a call back. A couple of calls later, I got a return shipping label from them and a refund. They also said they would talk to the stores as the stores went against policy. Even if the store didn't carry that theme, they could take it back and return it to the warehouse. They also gave me shipping, I think, because I had such a horrible experience at the first store.
I went to The Party Company store locally and bought DD's birthday stuff. Later, I had to find a Safari hat and reluctantly went to a new Party City - and noticed that they DID carry the shower theme there. I could have screamed.
I got my money, but the service at the local store was deplorable and it was such a hassle to do a simple return. I will not be shopping there again if I can find same items elsewhere.
I also try to avoid WalMart. Now that I don't live near one, it's easier.