4 Times return frustration..

They delivered the incorrect product four times. I had to return the order four times. Each time I explained that the product they delivered was correctly marked on the packaging but inside, was the incorrect product. After each time I returned it, they delivered the same incorrect product. On the last occasion, they told me that they were out of stock and they credited me with the purchase price but not with the delivery fee that I paid. Mind-boggling....