Service station bad P&Pay service station Brentwood park

I filled my car with petrol at the P&P filling station in Brentwood Park shopping center and paid using my credit card put in my pin the machine said approved at that point the attendant turned away and walked away to do something (maybe to fetch a machine for loyalty points on returning he said the payment did not go through I asked for the slip to confirm this and he said the machine did not print it. I then asked to see the manager and an African lady came out after an issue I said she can have my details she said I can check on my phone if the payment I do not have this facility so she took the loyalty print and wanted to keep it I insisted that it is mine and she cannot have it and she must get her own paper with that she turned away and passed a derogatory remark in her language about me t annoyed me so I walk away got in my car stating that after a day or two when I can check that the payment did not go through and then pay with this, I drove away I will return to pay if The payment was not made however I do not accept things said about me in a different language