Telkom Stole my Money

I recently changed from Telkom ADSL to a different service provider, I have been with Telkom since Mid 2015. I took out the 4MBs Package with them, and have been billed with this since the start. Only to find out now from the new service provider that 2mbs is the fastest speed available in my area. I have been paying for 5 months for something they haven't delivered. They have also not even picked up the fault on their end yet, only now that I change do I hear that it is not possible to have a 4mb line.<br> I want to be refunded every cent you stole!!!