Yeah, thats not good. At least he editted the message.

Honestly, unless you have a support forum like Redcat does, I personaly would not try to take care of CS in public on the net. I would email the customer and contact him there so dirty laundry is not seen and you can at least try to continue to keep up a positive appearance.

Also, I believe Redcat directly too offers discounts every now and then, depending on what sales and specials they have going on the time. You would just have to ask.