Hand over settled account to debt collectors.

they handed over an account to VVM that has been fully paid, I keep on receiving SMSs from VVM debt collection but when I contact Vodacom they told they did not hand over the account , they promise to send me proof so that i can send it to vvm but nothing, I spoke to Evodia and she promise to send me something till today. when I call no one knows her. account reference ***-5