Teechip Teechip.com, BT*Teechip They advertise a product that doesn't work Fremont CA

I bought one of Teechip's cups that are a solid color, then when you put any hot liquid into the cup the color is supposed to vanish leaving a message behind for the person. They offered the cup in several colors with several messages. 

I ordered one in red for my wife for her birthday.  When it arrived I gave it to her for her birthday and to my embarrassment, it didn't work. We added hot water to it. left it sit for an hour and still the color didn't vanish.

I contacted the company and told them if their product doesn't work or there's a problem with the red, then either send me another color or give me a refund. They said that they were sending me another cup.....same color. So I believed that I must have received one of a bad batch. 

We received the new one and tested it....no different from the first one, it didn't work.

TeeChip doesn't show a phone number, which should be a red flag for anyone that wants to do business with this company. I contacted the company via email and all I get is that they'll send a replacement. No acknowledgement that their products are defective or that they can ship another color.

Beware doing ANY business with this company. They obviously don't stand behind their products.