Bad service and lies

I signed a contract for R399 75GB day and 75GB night. Mighty MTN charges me R399 however they are giving me 30GB day and 30GB night. I have sent MTN and Mondo emails. Called MTN and they said i must take it up with Mondo. Mondo does not reply to my emails. Pleasee see below:

From: haymes themba <***> Sent: Monday, September 14, 2020 10:16 PM To: MTN Sales <***> Subject: ***4 This Message originated outside your organization. Please use caution when clicking on URL's and senders requesting information. Good day Please see the attached documents as requested for the ZTE MF286R on MTN home Wi-Fi 75GB for R399 per month.

Regards.