Worst experience I have ever had buying a part!!!!...

Worst experience I have ever had buying a part!!!! They shipped me the wrong part and I told my customer that their part would be in today 3/3/2017. I called customer service and they told me that they didn't control what parts went out and they can send me a new part but it would be another week before they would ship it to me. I asked him why this was my fault and why they couldn't make it right. He said that if I didn't like the process he could issue a refund and I didn't need to shop with Rock Auto anymore.