MTN trying to rip me off and loading less data than the contract data amount.

MTN SA is jst the worst. i took out A 80GIG data contract which comprises of a 40gig day + 40 gig night data and a 20gig anytime data +14gig entertainment. i was happy with the contract until the 12/11/20 when incorrect data was loaded. i suddenly had 47gigs day data instead of the combination of the 40gig day + 20gig +14gig = 74gig data. When complaining to MTN my issue is ignored and not taken into account. data sim in question *** complaint reference number #***