Not happy with service

Vodacom gave me a new line three months ago. When the agent called the indicated that i will be getting 10gig. When it was activate it was 5 gig anytime and 5gig night shift. I then called on many occasion and they indicated that they compensate me. They indicated that they will give me two month credit that amount to R860. I called again at end of august and they indicated they could see that a called a lot and will ensure that the correct department will contact me to resolve the issue. Today im still waiting as i indicated that i want to cancel and they can collect the device and want to refunded.