They really ticked me off recently, I've usually had good experiences with them.
I returned like 6 items back in November. I know what you're thinkin, 6 items?? I was planning to replace the oil pan in my subaru, hoping that would take care of an oil leak. Decided not to after pulling my starter and finding it covered in a film of oil, and my clutch is also slipping after only 2 years and 20k on it, rear main seal, thanks subie dealer that replaced the seal 20k ago!
Anyway.. I returned an oil pan, a couple things of rtv, and I can't remember what the other things were. I went to whole foods since they opened the earliest, I watched the kid scan everything in. 99% sure I got notified after that I had been refunded. Fast forward to February, I get multiple emails saying I'm getting charged again because they never received my stuff, all of it. Thankfully amazon CS was super nice, refunded those new charges, looked into it and said yes, it was a mistake, the items had in fact been received by the warehouse. Wonder if anyone else has had nonsense like that happen before.