Should I get my money back for a fake Loius Vouitton purse that I was told was original at a goodwill store ?

An employee of a goodwill store told me that the purse was worth more than $2,000.00 and I paid $300.00. I found out that it is a fake. The manager of the store told me that they have the policy of "no exchanges, no returns" and that no one in that company tells the costumers if the merchandise is genuine or not. The stores have big signs "designers" for the more expensive clothes and the expensive shoes, purses, etc. are kept in counters, separate from the rest of the merchandise. I was taking pictures of that and the manager screamed to me to get out of the store and began to call the police. Is their "no refunds policy" above the law that forbids the sale of fake merchandise as genuine and set a price accordingly ? how can I handle the fact that the employee actually told me that the purse was worth more than $2,000.00 when she and the manager are denying it ? Thank you for your attention !