Firstly, you will get this Email from those people the same as below,

Dear sir/madam,
Thanks for your Email. This is from Mars Education Co. Ltd. We do need English teachers in Sichuan , 2013. The teaching task is not heavy, just teaching oral English to primary/middle school students. The new semester will start on 1 Sep, 2013. If you are interested in the job offer, Could you please send your Resume/ Personal life photo/Passport copy (first page with photo to confirm if you are a native speaker); visa copy/Bachelor degree copy; teaching certificate copy to me?
Here is the job information:
1. Monthly salary: 5000-8000 RMB after-tax(for the first year).The workload is not heavy, just teaching oral English to primary/middle school students
2. There are no more than 16 hours each week (face to face teaching)
3. The location of the school is some cities of Sichuan
4. Work date: from Monday to Friday
5. The age of the students is from 7 to 17 years old
6. Help to apply work visa
7. Provide accommodation
8. Offer holiday allowance including subsidy of travel and air fare and a completion bonus (the holiday allowance and completion bonus will be paid together after an academic year)
9. Paid public holidays
10. Accident Insurance
11. Contract period: 1 year
12. Starting date: in September 2013
My Skype id is : uicc520217 and sharon54451. QQ: 1478170435 It would be more convenient for both of us to communicate with each other. If you are interested in our offer, please do not hesitate to contact us.
Best Regards
Grace

Then they will introduce you to a school, and after having the interview and signing the contract with the school,

The will fake your signature and they will downgrade your salary to 4000 RMB, and you won't be able to do anything.

If you reported them no one will stay by your side, so take care and stay away of those liars, as I was cheated before and I do not want you to get cheated too.