Vodacom The *******

I am so livid, so an agent called me and said they are offering free migration for all the clients with contracts and the reasons for this is that they are reviewing all the contracts since they received complaints over the benefits that are currently offered and she said I won’t be charged any fees, my price plan won’t change. Boom, my price plan has changed and I’m supposed to pay for that, mind you this is the second time it is happening some time last year my price plan was changed without my consent where the agent had also said it won’t be affected. Why lie to clients?