debting extra

Hello peter!<br> <br> On the 07-10-2015 i received i call from Zonke,Afri Direct-NSFAS informing me that i have to repay the study loan.i agreed and requeted them to deduct R150 as iam still on the internship program.last month they deducted R270 and for these month they will deduct R500.i contact nsfas nd they are saying i have agreed on 500 which is not true.nd i am still a student furthuring my studies.pls assist