buyer told me that
"The water bottle pump does not work. Power supply is good. I put a meter on it. Pump is Bad. What can We do to resolve this problem?"
I requested a video or evidence from the buyer, but the buyer told me that.
"To try to take a video of a water pump that does not work is stupid and ridiculous. It does not work You Are going to send me. another good one or give my money back?"
I will refund money or send new products to buyer, if I get the evidence.