Disappointing service

I'm so disappointed with the service I've received from mtn retention department. On the 5/12/2020 I upgraded to a black Friday deal which includes 50gb of data with a handset however the agent who assisted me upgraded me to an incorrect package which included 10.5gb of data in stead of 50gb. When I received the handset I contacted mtn to informe them that I was upgraded to an incorrect package. I've called mtn over 20 times to sort this matter out however they did not. It's been nearly a month mtn failed to correct this matter I'm still awaiting for somebody from mtn to contact me. I would never recommend mtn to anyone.