No action after sis months and very disgruntled!

I agreed to a Vodacom contract through Mondo of R129-00 per month for 2 gigs. That was October 2015. I get charged R139-00 per month. After numerous phone calls and mail from my side this matter has not been resolved. Kim from Monod Customer Care phoned me on 26 April 2016 stating that this will be rectified and I will get no refund, but the contract will be for the next 24 months at R129-00 per month. This morning again R139-00 were taken off my account. I am fed up with their promises. All I need is what was agreed upon: i.e. R129-00 per month for 24 months since October 2015! Get your act together!