I purchase a cell phone case from your own/line store. it does not fix, can I exchange it at my nearest store?

Check to see that they have a like model and bring your receipt

Be sure that they have the item in store otherwise they will send you back to their online store.

Yes you do, you just have to bring the purchase ticket

Ditto above comments

Yes

Yes you can.. bring in the phone and the receipt to your nearest Wal-Mart