What can I do when a store refused to deliver a purchase that I already paid for?

Question Details:

I purchased a mattress set 2 days ago. I have the invoice and sales receipt. I also paid for delivery. The next day the store manager called and said they sold me the pieces for too little, and if I wanted the box spring then I would need to pay an additional $189. However on my invoice, all 3 pieces are included with individual prices listed for each piece. What should I do?

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