Terrible service from Rewards co

I purchased 100gig mtn contract on the black friday special for R299. For the past 2 months I'm being billed 75 for 500mb. This is not what I enquired and signed up for. I called rewards co and was told that mtn didn't give them the correct code for this special and they are having lots of problems. Well really this is not the consumers problem. I have been calling and emailing and i think I have been more than patient with this company. I will stop the debit orders because I didn't ask for 500mb contract this is utter nonsense. My query is not taken seriously at mtn and mondo so I want the public to be made aware don't deal with mondo sales go directly to the service provider.