Hmmm...that's strange...because the company is still selling product, which means that they are still making $$$. If you can't find the phone number for the company through your DD, maybe you shouldn't even bother posting here.
However, I am always willing to throw a dog a bone. Why don't you start your DD off by contacting the C.E.O. of HPRD (OTCBB). HPRD markets/distributes ZMTX's products...