My phone is blacklisted without me requesting it

My phone was stole on 29 May and I got a new sim and used a borrowed phone. I could use the borrowed phone from 1 June and suddenly today (9 July 2015) I couldnt use the borrowed phone. The error message is: \Not registered on network". I contacted the service desk at 08h00 thid morning and they said it is a problem that VODACOM users are experiencing and their technicians are working on it. The helpdesk person said I should just reboot my cell wich I did serveral times. I phoned VODACOM again at 12h00 and the call duration was about 40 minutes. First I spoke to the helpdesk who transfer the call to thier technical division (082 155). The technical person"