Here's HongKong DaDa Enterprise Service Limited (http://www.dada-hongkong.net/). 
Company Adress: Room 1808, South Tower, World Trade Centre, No.371-375 Huanshidong Rd, Yuexiu District, Guangzhou, China.(Line 5, Taojin Metro Station, Exit B)

Have you have the problems of extension your China visa? You want to stay in China for long time, but the visa is not allow you to realize your plan. If your visa expired, you still didn't leave China, you continue to do what you want; you will be fined by the government. and not allow you come to China within 10 years. Such a bad thing, I think nobody will like it. Right?

So you don't need to think about the problems of visa extension. Now we can help you to extent visa for 3months, 6months and one year. During this time, you can do what you like in China, you also can go out China to your country, or other place. We will help you save a lot of time and money ,if you want our service.

Any more information, please feel free to let me know. I will reply you as soon as possible. Thank you!
Eva: 13539979202. dada22_hongkong@hotmail.com QQ:2810919061