Poor Customer service

Hi on the 27 February 2024 i made an order via Payjustnow, it stipulated there that the courier fee will be R150.00 which was included already on the amount I'll be paying on a monthly basis. A day later we get a call from a guy who refused to give us his name from Precision Wheel Solution who then told us that the courier fee will be R650.00 and we have to pay it before delivery. When questioned why it's not written or stipulated when we made the order he then said it was a system issue. We requested to talk to the Manager he just hung up and to our surprise we saw that it was refunded to the Payjustnow wallet without our acknowledgment. When we call he just hangs up the phone since the call goes straight to him. I feel like he was trying to de***** us and they are very unprofessional