Devastated

Earlier this year I complained that I am receiving calls and threats everyday from vvm telling me that I owe vodacom R6000 for data. Apparently they said that I have a contract with vodacom which is not true. I have been using my number for more than 10years and I have never in my life take a contract with vodacom. I was told to submit ID copy and avidafit stating that I don't have a contact with vodacom to *****ulent company. They gave me an email address and promised me to investigate the *****. It's now 2 to 3 months, I have emailed the documents and to my surprise I am getting no response and still receiving calls everyday and smses. What can I do as this is destroying my credit score? I have never and I don't even have a contract with vodacom