Stressed, Depressed and Angry with what Vodacom is putting me through.

At this point I don't know what to do with Vodacom, I just received a statement they billed me twice, for what I don't know, from January I have been trying to get them to get their accounts and my name up to date but I just received a statement and they billed me twice....I am weak and stressed, who can help me with this, must I open a case against Vodacom or what is it that I must do....I won't afford what they want me to pay because I don't even know what is it for....