Vodacom has disabled my Caller ID

<p>I upgraded my contract that I've had with Vodacom for almost 15 + years to a top up in December 2016 and since then my caller id is disabled. All the calls that i receive are displayed as 'unknown' and Vodacom has not been able to resolve this after many calls to them. The call center agents are rude and the legal department just slams the phone down since apparently for some reason the nos that i have is not registered with the system. This contract has been my only contract for about 15 years. i dont understand how vodacom cant pick this up.</p>