I ordered an item from this company through Amazon...

I ordered an item from this company through Amazon. I was given a tracking number. I waited a week or so to receive the item, I just received a refund due to undeliverable address. I order from Amazon 4-7 times a week and no issues. I called UPS they stated they never received the item. The tracking number states its still being shipped. I contact PC Parts Unlimited and the rude customer service person stated they shipped to address on Amazon form and that UPS sends back stuff all the time. I mentioned to him that UPS never received the item at all and that's what I see with the tracking number too.. It will show when the item was scanned at the receiving center. He would not even lookup my account to see the exact address they say they shipped to. No customer service skills at all. I read there on Google reviews that I'm not the only person having issues with shipped items. BBB here we come.