False marketing and misrepresentation

I was search for wifi subscriptions on mtn online page, I came across the package of R465 month to month 20Mbps which I became interested and wanted to apply for it. The next day one of the agent called me regarding this package but there was a twist I was told that this package is on promotion, that I need to make an upfront payment of R746 then my next payment will be end of June 2025 and my monthly payment is now gonna be R399,to my suprise last week I receive the statement that says R360 is due on the 15th June. This is not what I signed up for i wanted uncapped wifi of R465 month to month but now it seems I'm paying more than what I asked for. I don't know that R360 is for what because I was told I'm gonna pay R399 end of June. Please assist me because I'm tired of these agents who give us false information for them to gain.