Incorrect contract details resulted in overcharges

I signed up for what I thought was the Infinity Select SIM-only package with CellC at your Woodmead branch on 14/11/2014. The package is supposed to be unlimited calls and SMSs (and 3GB) data for R999 pm.My monthly account is currently sitting at R1509.33. I was shocked to find out that I was signed up on the wrong package and have been getting charged for any calls that were non-CellC lines!! I phoned into the accounts dept today and while Sipho was very helpful, he had to hand over my case to another dept for resolution (***).Although this is a personal contract, it is used for business purposes, and I asked the consultant (Nikisha Pather) at if I would be able to make unlimited calls to any network within South Africa on this package and she said 'yes'. I wasn't even aware that there are 2 different Infinity packages on CellC, and was not informed by the sales consultant either.This contract needs to be switched over from Infinity to Infinity Select asap at no cost to me, AND as this is technically a new contract I insist that I benefit from the Infinity Select package as it is currently stated: Unlimited Calls to ANY network, Unlimited SMSs and 10GB data per month!