Charged for services not rendered

Vodacom added a charge on my August account without me requesting the service. Their phones are always busy & was unable to contact them. I logged a "call me back", however, I received an sms saying I already have a callback request pending? That is also incorrect. I have no callbacks requested for at least the past 2 months. This means another one of Vodacom's services not functioning. Pathetic service provider. Vodacom, I want the unauthorized charge reversed, and the callback requests from my number deleted. The address on my statement is also incorrect, I requested the change months ago.