Incorrect Data purchase and useless call centre agents

I bought Data on my banking app. In error I bought 70g for R389 which is Super Data, however, I wanted to purchase the 60g everyday Data which is R399. I called the customer care line this morning cause I saw that my Data was loaded but was not active. Their call centre agent didn't even provide a solution of some sort, she just told me that " well you've lost your money, there's nothing we can do for you". Well MTN I WANT my money back or Data that I can actually use. I will not be told that well I lost my money. This is no game. I won't be using this useless data that requires me to have a router in order for me to use it.