I want them to call me asap

I have paid r529.00 at pep 27th April these only a difference of r40.00. Called your call centre Nangamso she made me to hold for 10min without talking to me.From yesterday they promise to get back to me.I only short of r40.00 .I wont pay r569.00 and these no one to help.I see way poeple go to VUMA.MY ACCOUNT NUMBER WITH THEM IS ***.Called Bigshaw he did the same