Voxpopme moment is a Sam,pay up

I emailed TNS several times regarding my payment for the online research that I completed and instead of R1100 being paid R850 is what was sent on email to confirm as payment. I was **** to but now I am being avoided I used my time and data but when its time to be paid no one is responding to my emails Joanne Tessendorf is not responding to my emails that is after I attached two screenshots to prove the incompetence of her team but she is not responding. I want my money because you guys are a **** and an insult to the market research group