Pathetic Service

Yesterday i went to an Engen petrol Station Engen@Essacks in Sparks road Durban, I filled up my tank and when i typed in my pin code the hand held terminal requested an attendant code , so i handed the terminal back to the gentleman that assisted me, He told me that the transaction did not complete, but i showed him the sms which i receive from my bank stating the funds are reserved for the purchase, i asked to speak to the manager and was met but Mr Wassim, whom gave me a lot of stories about the bank not paying them and he is tired of losing money, and he cannot allow me to leave because if the money does not clear i wont come back to pay him etc, i showed him the sms stating the money is there for him and i also showed him my account balance, he still insisted that i make another payment as its impossible for me to leave without his system reflecting the amount, by this time i was annoyed as i had my kid with me taking her to her Paed Appointment. I am totally disgusted as i have contacted my bank today morning and it is clear that there are two transactions for the exact same amount, so now i have to complete a dispute and wait for up to 14 days to receive my refund. I just want to state boldly that his service station and Engen have lost a customer that fills approximately R2500-00 fuel per month.