Difficulty getting ITC number from Vodacom

My phone was ****** a while ago, and I am currently in process of claiming it from insurance. Unfortunately, I need to blacklist the phone first and receive an ITC no. However, it takes ages to get this number from Vodacom. I've been calling their customer care numbers for days, but to no avail. Some help in speeding up this process would be greatly appreciated, but at the moment all I get from the other end of the line is a pre-recorded message saying that "[they] are currently experiencing high call volumes" and that it would take a while for me to be put through.