Vodacom *****ing money from customers

I did tke out a airtime advance and i did repay the airtime advance and still they charge me for the airtime advance I was a customer since 2009 I was a customer for the past 17 year I will cancel all my contracts as vodocom start to be "*****" Vodacom must wake up customers do pay their bills and advances in time and still vodacom is trying to ***** our money