MTN Service sucks

About 3 weeks ago I got a call from an agent saying I qualify for a 20GB monthly data contract which will cost me R89pm. And that the cards will be couriered to me, which i received a bout 2 weeks ago. On the MTN delivery note there was a contact number which when you call belongs to Mondo. And the message is that contract will be activated after 48 hours. Its more than 2 weeks since i received the cards and my data still has not been activated. The message I get is that Sim registration failed. There were 2 cards inside as one seems to be for Voice which doesn't even allow u to call the MTN customer care line. Says you have offers to buy data but when you do it doesnt allow you. And when i send emails to MTN and Mondo nobody bothers to respond. Im frustrated as it seems there is no one to contact to sort out my issues. And on the other hand the consultant told me my contract would be for 6 months and then I can upgrade. But my statement shows its 24 month contract and amount doesn't show the R89 i was told but R104. When you send emails you just get automated response that someone will get back to you in 8 hours but dololo