Extra charge on account and BAD service

To whom it may concern. Ive been trying for 3 months to fix my account on cell number *** and every time I've been phoning the client service keeps on talking me empty lies. Eventually Thumi from Vodacom phoned me and told me my money will be credit as they over charged me. Until today no money was credited and i need to phone every time and keep waisting my time with the call centre. This is very bad service and is unexpected for one of the big cell phone companies to keep a query for more than 3 months. Ive asked to talk to manager of the call centre and they just put the call on hold. I need this fixed as you charged me R500 more on my contract. Please phone me regarding this bad service.