Blacklist without my knowledge

On the 3rd of November 2015 my phone lost a network in the afternoon. I took it to Vodacom for repairs and it took a week to come back and it was not fixed due to the fact that it was blacklisted. On the 20th November the phone still had no network I then inquiry about who blacklisted my phone they told me that Telkom did it. I had to do an affidavit at the police station. O the 23rd November We send an e-mail to Wickus Van Rooyen \Vodacom Corporate Partner"in Hartfield Pretoria.. On the 30th November I went to Vodacare in Benoni with the phone because there was still no network and when they scan it"