Data cannot not be transferred

On February 11th, my brother and I purchased 10GB day and 10GB night data for R469 through the banking app. However, there was a discrepancy in the middle numbers of our respective phone numbers; mine ending in 789, while my brother's ended in 798 on the banking app. Consequently, the data was mistakenly allocated to the other number. I contacted MTN, inquiring about the possibility of transferring the data to my correct number, noting that the number in question had not yet been assigned to a user. Unfortunately, they informed me that it is not possible, and the data will remain on that SIM card until it expires.