Unhappy and mislead

I have been trying to cancel a vodacom contract which was sold to me by a Mondo agent for the past two weeks. I am currently using MTN and i specifically told the guy i was speaking to that i wanted to port to vodacom and use the new vodacom contract on my MTN number. He assured me that i would be able to do that once i have recieved my new vodacom sim card. To my surprise i was told by vodacom that it is too late to do that once i have recieved the sim card. Secondly the deal he was selling me was for 80 gig per month. I was surprised when vodacom told me that it was only for 30gig a month, which yet another lie. Another lie which he told me was that the first debit order would go off in October which was untrue because i was told it would be within 48 hours by vodacom. I dont understand why your agent would lie on purpose just to sell the deal. You are behaving like ****** and leave me to sort out the problem. You are very misleading