Vodacom ********* and BAD Service, Lies

Vodacom phoned me, they told me they going to upgrade me to MORE GB because i am a good client, and i am going to pay less than what i am paying, For the next two months now i Am paying doube the amount as always. I locked an enquire, and Noah said Vodacom will contact me in a week, and wiil credit my account, it now month later and still nothing was done. I am totally frustrated with VODACOM and their client service and ********* behaviour.