Celeste Home Luxury Weight Solid Cotton Flannel Duvet Cover Set, Twin/Twin XL

I ordered a duvet cover in white. I received, after several weeks, a duvet cover in cream. I called Macy's who told me to return and repurchase it. I did this and took the wrong one to the UPS store. The second time I received exactly the same wrong item, a duvet cover in cream. I called again, especially because the item was no longer at sale price, and went through the same process again, and a few weeks later received, yes white this time but a sheet set instead of a duvet cover. Before I had time to call about this, I received an email saying that the return had not been received (16 days after taking it to UPS) and that they would charge me for it. I have emailed them the tracking number. Meanwhile, are they expecting me to just lump it and keep the wrong thing? What kind of business practice is this?