Overcharged

I am not happy with vodacom business ethics, i noticed there was overcharged amount on my contract. When i call vodacom they transfer me to their rude contractor who dropped my call without even calling me back. I really feel vodacom let me down and dont want to take responsibilty. To date no one has contacted me after they forwarded me their message that they will contact me. I tried calling again with the same treatment as the above. My only option is to go the legal route. Vodacom is no longer the same i will advise people to try other networks when they want to take contract.