Prepaid Data Loss

I bought data worth 1k on the mtn app and the payment method was the bank card. I received a confirmation email and the transaction number, however, my data was not uploaded since. I am not getting help from the so called service champions and on emails. I suppose I lost 1k over an *********** service network. Mtn just ****med me a thousand rands and they are playing a blame game. Never buy data for large amounts on their app!