Complaint about Complete computing inc.

I bought three bottles of contact lens protection liquid from a glasses shop last month. One day, i found a news on Sina, which said some products of Complete computing inc.(http://www.amochina.com) had defective issue. I checked my purchase and found what i had bought were just their products. Later, the company gave a list of defective products numbers and announced they would offer method to call back these products. Few days past, they published the so-called method: customers post back the defective products based on the address they offered. And the company will give money back including the post expense.What a perfect method!!!!
I packed the products into a box and took them to the post office of China Post. But, after the official knew what i wanted to post,he refused to accept it, the official told me that the chemical material was forbidden to transport. Oh, though i was not satisfied with his attitude, i decided to change another post company.
More unfortunately,as the clerk of another private post company saw the address i wrote on the box, she denied me again, because the address is an interior postbox number of China Post. (The biggest post company in china.) And the private post company can not find the address without specific geographic address (location) or telephone number.That meant only the China post can deal with the transportation,
The clerk suggested me to connect with the service center of complete computing inc. , i accepted her input and dialled 800-988-0903. Unbelievably, they told me that it was the only way to post the defective products. And they can not offer any other address or telephone number.But how can i post them by china post? They refused me! "You can complain them by telephone number 11185."The service center clerk told me.
Oh, my god! what is the major problem? To complain the China post or post back the defective products? I was puzzling.
After i phoned the 11185, the post official gave me a reasonable answer: "How do you prove your package is safety, un-flammable and innocuous. one way you can choose is to find a certification issued by producer." I think he is right. So, i have to call back the complete computing inc. . you guess what? They gave me the same answer like last.
As i know, according to chinese products quality law, both the distributors and producers are responsible for calling back the defective products. But why did the company only choose only way to deal with the problem.Maybe they donot want to confront his distributors, however, should consumers always be the ultimate receivers? I donot think so!
I have already emailed to the head office of company which locates in U.S. I described what i had encountered and hope they could give me a positive response and explanation.