Vodacom refusing to refund me for incorrect billing

This Vodacom is on a mission to frustrate the hell out of me. Extremely bad service from Ntombi who was suppose to assist me with my refund for incorrect billing on my fibre (WIFI) account. I am being sent from pillar to post and at some point she told me in so many words that I am not gonna get my money back .I asked to speak to the manager or supervisor and she kept me on the line for a very long time. I cant wait for my stupid contract to expire because i am so sick and tired of this Vodacom incompetencies.