Cell C attorney *****

I have been handed over by Cell C in the start of this year to Hammond Pole attorneys, i am paying them off monthly as agreed.

Now Cell C got another attorneys company to hand me over again for the exact same amount i was haned over with at the start, i advised the new attorneys Shapiro Shaik Devries that I have an arrangement set with Hammond attorneys already and they knew exactly who this was and advised they only call when I havent arranged with another attorney as well.

I got an sms this morning again from SSD attorneys demanding payment of my full outstanding amount with Cell C.

How the hell does this work, i am paying what I owe. Also Cell C is now taking money again from my account even though I have no new contracts with them R409 goes off my account. HOW DOES THIS WORK?