Traci, I had a situation with a knockoff and here's what you do, before you assume these aren't really Freebirds:
You call up the company and ask someone if they do sell thru Amazon
If they do, you can discuss with them your concerns for thinking these may not be genuine, and get advice.
If they say no, they don't sell thru them, you've obviously got a watertight case for getting a full refund. (You'd need to get some written statement from the company stating that they don't sell thru Amazon).
Then you'd call your credit card company and explain your situation. They'll probably connect you with their fraud department.
Anyway, ultimately you will be refunded...plus you'll get to keep the shoes!