worst service

We received a bill higeher than normal when I phoned into the call centre to question this I spoke to verana in the call centre which had a terrible attitude towards me I eventually found out that in December cell c added extra services to my account that I did not request so why do I get attitude from a consultant because they add things and I should just pay???? Is this the kind of service that I pay for every month???? Why should I pay for things I did not request????