Charged to see who is calling me

I recently signed up for a vodacom contract. I chose the package I could afford and signed up for 24 months. I started receiving a LOT of calls from \unknown number"and then realised that something was wrong. I called Vodacom and they notified me that to see who is calling me will cost R10 extra per month.<br> <br> This is ridiculous. Surely the whole point of having a phone is to see who is calling you. On pay as you go it is a standard feature.<br> <br> No where on the contract was it specified that I needed to sign up for this additional feature.<br> <br> Shocked. Total ****************"""