Who's in the Wrong?

[MTG#10]

Bought some furniture on March 3rd. I was told by the sales rep/manager that it would take 4-6 weeks for delivery. I waited almost 8 weeks and never heard a word so I went back to the store and the manager said the reason it was taking so long was because they originally sent the wrong purchase order number to their vendor, and that it would be another 7-10 business days. I told him this was unacceptable and just wanted my money back. He agreed and said I would receive a check in three business days.

Yesterday he called me and said he could not refund the money, but could give me store credit. I told him I just wanted a refund and he said he would call me back. Today a different manager called and said they could issue me a refund minus a 20% restocking fee (almost $300). They are trying to use the excuse that they are losing money because they still had to purchase the furniture from their vendor. I said that's not my problem, I bought the furniture from them...not their vendor. They can still sell it to someone else and still profit.

Any suggestions on what my next course of action should be? Im sure someone here will try to twist this and claim its somehow my fault and I should have to pay the restocking fee...