CONTRACT UPGRADED WITHOUT MY KNOWLEDGE/APPROVAL

I cancelled my contracts with Vodacom mid 2015. I have just received a sms from VVM attorneys to contact them regarding my \handed over\" account with Vodacom. I am unable to reach a Manager at the attorneys and cannot escalate this on there side. My contracts were cancelled after the 24months period and was not upgraded by ME. Upon cancellation I was informed that the migrate to prepaid cannot take place unless the full outstanding balance is paid, which was paid and my lines were migrated to prepaid. <br> <br> I am utterly shocked to discover that 1 of my lines have been upgraded without me actually signing any documents or without proof of my original RSA ID.<br> <br> Please can someone urgently investigate and revert with a solution. As previously advised my account balance was 0 when my cancellation was completed how is it possible to now be handed over for an outstanding amount?"