R9.50 for Caller Line Identity

I personally feel that Vodacom is ripping us off with their Caller Line Identity service which we have to pay R9.50 per month so we can see the phone numbers that are calling us. I was never told about this and I thought something was wrong with my SIM card as every number that called me would not be displayed. This is only charged on contract customers and I've had contracts with Cell C and MTN before and this was never charged. I am disappointed with Vodacom and I will not be renewing my contact.