Terrible and *********** service from MTN AGAIN!!!

MTN's service is atrocious to say the least. On Friday the 19th of June I received a call from Zandile Gcwensa where she offered me a data migration upgrade from the current My MTNchoice 5gb to My MTNchoice 10gb which I accepted and she then said the new plan will be effective within 72 hrs from the time I accepted and confirmed. To this day, no data has been loaded on my device. I followed up with a call to the call centre and spoke to several people in the migration department but nothing was captured on the system and they had no idea why the new plan wasn't activated. I have received no assistance and the new data plan has still not been loaded. This is the second time I have received such terrible service from MTN. Nobody seems to know how to do their job properly, they're all clearly ***********!!