increase in contract costs? Surely not

On Friday I received an email informing me that my monthly contract cost would be increased. I'm assuming this is a mistake as I signed my contract for 24 month period at a set monthly fee, only in December last year. If this isn't a mistake I will assume that vodacom is planning to reduce call and especially data costs to move in line with international rates. Let's face it, your data is very expensive and costs you next to nothing to supply. <br> <br> But for now I will assume that this is a mistake as a company as honest as vodacom would not do anything to cause them to be in breach of the terms of a contract