But giving me the amount I overpaid

I had been requesting my Juna statement for quite sometime and was not receiving it. I wanted to settle the account. On the 270627 they debited an amount of R1472.73 and I made payment of R2320.00 in the morning. I made a call to their customer service and agent stated that my balance was R2884.00. I then advised her of the amount I have paid. Which amounted to R3792.73. She then advised me to sent her the proof of payment direct to her email because I had already sent it to query@bradlows. Follow day it was confirmed that they received their payments. I then sent another query requesting a refund of R908.73 which my payment was exceeded with. 010725 they requested that I send the 1 month bank statement and the copy of my id for refund. I did send the requested documents on the 020725. I called in on the 030725 the agent told me the turn around time was 14 working hours. I received an sms stating that the query was solved. I have been trying to call in this morning my calls were being cut. Now at 13:29 070725 I eventually spoken to a consultant who advise me that the July charges were added hence I’m not receiving the refund. I then asked her how are July charges added when I was owing anything in July. The amount were to be added only if I’m owing. When I’m trying to explain to her she then raised her voice forcing me to agree with what she was saying, when I was angry at that she dropped the call on me. I have not yet received my refund. It is their fault that I overpaid because they failed to send me June statement on time. And I’m not owing anything in July for them to add any fee for July on my account. I’m not liable for anything in July.