my money { REFUND }not paid in full

to whom it may concern i have been an avbob client since 2014 to my surprise while checking my app i notice that u guys have been deducting two different amount for the same person since 2016/08/01 Mr. TR Ngobeni i then called u guys to clarify everything but i was told iam only getting a refund of R1500 which i don't even know how it was calculated i was hoping to get a refund from 2016 /08/01 as the two accounts are still active i want my full refund and also need to know how u guys calculated my refund since 2016/08/01