you are still not paid, you did not sign any reciept with the" Sec" , and you are paid less than normal .
I are willing to sue the " lin one "+ "sec", to gain your fair treatment.
although you got no evidence, but you are under protect according to the law, you --employee ,are always in weak situation comparing with "lin one"-employer , more advantage intends to you. call him right now, speak in "English" which you can express yourself well.
never yes , when ever you are not sure or not catch the meaning.