I had just purchased a couple of t-shirts online, and I realized I had mistake. I sent an email explaining what happened, and amazingly I got an immediate response back informing me not to worry and that they had already corrected my mistake.
After the shock of getting an immediate response, I wrote back obviously to express my gratitude, but also to let them know how exceptional their customer service is, and that I plan on spending a lot of money solely based on their customer service.
Thanks