Karri app - poor customer services

I have never in my life had such bad service. I paid via the Karri app for some of my sons school expenses - this was in Dec 2025 - I was called to provide the Proof of Payment which I did on the 30th of Dec 2025 - via email to them. I have sent so many emails as I saw that the funds I paid was still not allocated to that activity that I paid for (app that schools use to make it easier for parents to pay) - On Friday last week which was the 23 of Jan 2026 almost a month later I followed up again - Just to hear oh no you attached the incorrect proof of payment . . . . . I ask you - I was phoned on Saturday and spoke to a rude lady - no mam on Monday this will be sorted - so today is Tuesday - nothing has been sorted out!!! I really dont know how I need to get this sorted out anymore - paying for my sons things and then it not being allocated ....