I'm done with Ackermans

Hi, I have an account with Ackermans and sharing it with my mother. I am the one paying the monthly installments from my bank account the Tenacity Inc account. On the 28th of April I paid a huge amount of money into the Tenacity Inc account intended to pay it to my child school's account which starts with T as well. I called their accounts number to notify them of this mistake and asked for a refund, they said I must email proof of payment, PDF ID copy, a letter explain the reason for a refund and 3 months bank statements and as soon as the money reflects, they will make a refund. I did not hear from, I called them on the 2nd of May, emailed them and got a response saying "we have received your query and it will be sent to the relevant department". I have been calling and emailing them with no positive feedback until today they told me that they cannot disclose anything to me regarding this account because I am not the primary account holder. My mother is the one who is supposed to ask for the refund, she must send her 3 months bank statement so that they can make a refund to her account. All this time they did not tell me this only today when I insisted on speaking to the manager. Like what the hell!!! I have been paying this account for years and they never said but you are not the primary account holder but when they need to refund me there is a problem. I am closing this account as soon as they give me my money back.