hosiery and more Paid for but did not receive item. Internet

I ordered an item and received the wrong item.  I may have ordered the wrong one and so I sent back the wrong item, at the co request along with a shippint payment and instructions on the correct item I wanted.  I was told that they were out of that item and this co wanted to sell me a more expensive item.  I replied that I did not want that item and selected another.  The co said they would send me a paypal to send more money for the new item.  I never got the paypal. 

I called the co at least 3x, and left a messages.  They did not call back.  I filed a dispute with the credit co.  I received a letter from the credit card co along with a copy from the co reply to the despute.  In it the co said I did not return the item.  That is not true.  The package was not rerurned and I have the cancelled check for shipment of the correct item that was included in the package of the returned item. So I know they received the returned item. 

So I paid for an item, paid for shipment twice and did not receive the item.