Refund

In 2018 I bought berries with Fedgroup for about R 600 and on they app back then it was reflecting, but when go in to the app now,I don't see the purchased I made. whenever I complained about this, they only tell now 2021 that i did not purchase anything with them, so I am not happy with their services, I think they making money by taking from the innocence please assist with this matter, unfortunately I cant send proof to them that I bought the berries in 2018,but I believe that they can see on the system what I bought and when, the account that purchase with them I dont use it anymore that is why I cant proof of payment to them this injustice