We purchased a ceiling fan from this chappy store....

We purchased a ceiling fan from this chappy store. We changed our mines and tried to take it back. We did not still have our receipt so they said lowest price in 90 days. How many ceiling fan are sold in February? After talking to them they would give us 20.00 less then we paid. So I said what do you do with my 20.00 divided it. They thought that I was kidding and laughed. I am so angry about how I was treated. Can anyone help me?