Arrears paid up, but still getting calls for payment from Vodacom

Vodacom handed me over to VVM attorneys, to which I made arrangement to pay the arrears in full, which I did last year February. Few months later I receive more calls from another collection agency Burnard Raaff, demanding more money. When will this stop!!!! When you email or phone VVM they refer us to vodacom, when you call vodacom, they refer us to the new attorneys. When you contact the new attorneys Burnard Raaff, they request the proof of payment, which I have send twice already. Yet my name is still listed with Experien. Please clear my name ASAP!!!!!