Wife saw an ad on her phone with a link to a website and asked if I could use PayPal to pay for it. Didn't spend a lot of time looking at it myself, but went ahead with it. It was around 10PM or so. I'm generally pretty savvy about stuff like this.
Soon as I thought I paid, another screen came up for payment. Thinking the first one didn't go through I hit submit again, just to find out I ordered a 2nd set discounted a couple dollars or so. It was very deceptive the way they did that, so now I'm mad. Went to the website, and tried to cancel, but they required an order number which I had not received in email yet. I submitted a cancellation request, but it just generated a "We will reply soon" message. At 5AM, they reply with "So sorry. It has already shipped so too late to cancel" Of course the tracking number they gave me didn't say it had been picked up until at least a full day later, so that was all BS.
I contact PayPal and file a dispute and they open a case. While the status is pending, the seller replies that they will give me 50% off if I drop the dispute which I ignore. Contact PayPal again, get a live person on the phone, and they advise me to just refuse shipment, which means USPS sends it back without me having to pay any return postage. Tracking shows it going from China to Hong Kong on some courier service and then transferred to USPS in San Francisco. When it finally gets delivered, I take it back to my post office and refuse it. Tracking number is still the same, so I update the PayPal dispute, and after one more discussion with a live person at PayPal, the case is closed in my favor.
Frustrating, and time consuming, but PayPal did a great job resolving the issue.