Chinese Companies

There are many companies in China, which are cheating foreign companies. Recently, I came acroos this company called China Zhuhai Zhong Tuo Trading Co. They placed a huge order with us and called us to China to sign the deal. They are based in Zhuhai. We went there, signed the deal, but then they asked us to share the 'notarization fee' for the legalization of the contract, and we paid them 2700 Euro for it. After which they asked us to pay another 675 Euro as exchange fee, which we, as complete idiots, did again. They turned out to be frauds.
Another company with the same intentions approached us; this one is called Hebei Wansheng Trading Company, based in Beijing. They asked us to come to Beijing for signing the contract, and for the same notarization fee and exchange fee, though the amount for these differed from the former company.
This blog comes in to warn businesspeople, if they are approached by these companies. They are scammers, frauds.
Very strangely, the Chinese Embassy website has no trade attache. I looked and looked but found nothing.