No response from accounts department on Incorrect billing

I enrolled my child on this school for 2021 in July 2020 and paid the application fee together with January 2021 school fees as required. The enrollment process was a nightmare and I regretted choosing the school but it was later rectified until on 13 January 2021 when I received a statement showing that I was R3 325.00 was due by me. I wrote an email same day to accounts department attaching the proof of payment made on 21 July 2021and I got a response that the payment will be credited in February. I was very disappointed to see that the payment I made 5 months ago is not reflecting anywhere. After 2 months passed ( Feb and Mar) with no statement received on 26 April I received a statement still showing that I am in arrears and all other payments reflects except the R2750 paid on enrollment. I sent an email attaching the previous email sent on 13 January together with the proof of payment and to date there is no response. The people are very *********** and pathetic. They do not answer their phones nor respond to emails. Not only is the accounts department but the school itself seems not to have a direction or process in place. No communication from teachers nor feedback on our kids' school work and even when you request meetings they do not pitch. I regret enrolling my child in this school!!