bad methid of debiting

this company knows how to make money,i tried to kep my monthly payment regularly and we agreed on R500.00 monthly they do debit ,but there is an aditional of R50.00 every month,i did query this issue no one has ever come to me to clarify this ,cause my debit shows 500 but when i look at my statement it shows 50 is debited invisible to me ,do you people think i will ever finish this account? ey its bad to be poor cause pressure will always be on you ,i am pressured and ****** by this people and worse this ladies when they call you they expect you to answer calls but when you call them they drop your call,why