Very poor and inefficient refund process

I have read many bad reviews but did not expect this to happen to me. We paid an additional 6000 to the account due to a miscommunication. I need the funds urgently to buy my daughter a device and even though it’s clear that it’s an additional amount after full fees were paid, with no remorse I was dismissed with information that they can only invoice mid Feb and refund in March. I am highly disappointed that they would keep the funds and “wait” for invoicing even though it’s clear that there is a credit. My daughter will now have to wait for end of March to get a device for school.