Unfair, unprofessional and dismissive treatment from Sonja

I ordered cupcakes at cakes for Africa Willowpark, made an immediate payment on the 10th of October in the morning, worked out all the requirements with an assistance from a lady named Candice via email. I sent the proof of the immediate payment via email and it was acknowledged by Sonja. My pickup date and time was 13th October at 08h30..I arrived 30 mins early and waited as they were completing my order...before my order was handed to me, a lady came by and stated that payment did not reflect..I showed them my POP and went to an extent of showing them from my app thay it was immediate with the amount and indication..they called Sonja who is apparently the owner as she loudly said it to my face. I narrated the same story and asked that they check their system..she insisted that I won't get my order, I either need to make another immediate payment or I will have to come back tomorrow. She didn't care to try and check the system but kept telling me how its policy that says so..i asked to speak to the manager and she laughed loud and said "I am the owner"...another lady went behind the computer room and after a while called in Sonja...she came back out and said she managed to see my payment that Sonja refused to even diligently look for. I asked them to call Sonja as she really owed me an apology for how she treated me and handled my matter as a customers...she didnt apologize even when I asked her to.