A BUSINESS INCAPABLE OF EVER GIVING REFUNDS?!

I was told to pay R1450 in order for my fibre to be reconnected. This is usually covered by my mom but as she is unable to work, we decided I would pay R800 and she would pay the other R650. I paid the R800 as a cash deposit at 2pm today and emailed the proof of payment to ********** and by 3.30 I had gone online and added my mom's banking details for the balance (R650). I then proceeded to chat to Dawn to let her know that I had made all the arrangements, but she then processed the full R1450 from my poor mom's account and told me she could not refund my R800, but had to use the R800 cash deposit as a credit to my account. Now I would not mind a credit instead of a refund in the event that the refunded amount is a small minority of the total balance, but when the amount is greater than 55% of the total (a clear majority), then the amount should be deemed material, and thus refunded.