issuing phones without my knowledge

I am so fed up with Vodacom, i have three contracts that I am aware of but have been receiving a bill for about 10 lines now. Vodacom wants me to get an affidavit to say that these lines dont belong to me, yet today i see another two lines activated on my account. I AM NOT {PAYING THIS BILL ONLY PAYING FOR THE THREE LINES THAT I KNOW OF *** *** ***