Service added to my account without my knowledge

I requested from the call center last month that the life insurance on my account be removed and the lady assured me that the wont be on my next bill. Guess what.. It still is!!<br> <br> I have now sine last week requested that this be removed and have not gotten hold of anyone to assist. My question.... what gives Vodacom the right to add this to my bill without me signing for it? and will I be refunded for the past few months that it has gone off? Probably not. <br> This is *******.<br> <br> Just remove this from my account. ASAP