Vodacom not providing proper service

I got a data contract with vodacom in November 2017 paying R250 in October 2019 am told of a huge balance then I followed procedure the forensics department conducted an investigation only to find that two numbers where added to my account in a space of days , they confirmed *****, but still send demand letter of R29000 plus in February 2020 and handed my account to lawyers when I spoke to the lawyers they said they need authorization from vodacom , I have since spoken to multiple consultants and no one has been able to help me they send me from pillar to post and today when I tried to call they blocked my numbers, am very furious with this service provider they have blocked my things on credit bureau and I cannot do anything!