Proof of payment not accounted for

I paid an amount of R2500 on the 20th of January, I have been receiving calls constantly from Daly the latest call I made, Nonkululeko Dlamini answered and when I had explained the situation she check on the system and advised that they had sent my proof of payment to Standard bank. I asked her why did they not follow up with Standard bank as to what is going on, all she said was that Standard bank is at fault, that tells me that no follow up was done. She then said she will get her Manager to call me back who is Jessica Jaggurnath. Jessica call and she then asked how she can help, then I asked why is she asking me, as the person tell advised did not explain the situation to her, she said no and that she was calling me on her own and all she knows is what she sees on the system and she asked me again to explain, I then repeated again the person that asked you to call me not explain to you she kept on referring back to the system and said she call men on her own and then she hung up which was also very rude especially as a Manager which is disgusting. I mean R2500 is alot of money and because of this extra interest will be accrued on my account. Please please I'm asking for assistance as the matter has been dragging so long since the 20th of January 2025 when I made payment and proof of payment was sent on the 12th of February.