Pathetic service

My name is Charles Petje I brought my car in for rework cause the radiator installed was leaking. The mechanic mentioned that the radiator and the coupling would need to be replaced and that they are doing an order on Friday 12 April 2019. No one gave me feedback until I called yesterday. I was told sorry sir parts are ordered and you have to wait. I did mention to the mechanic when I dropped the car that I am selling the car. If I don’t get the car paid off today I will need to pay for it and the new car this month. I can’t sell the car until its fixed. Marvin informed me today after I followed up again that sorry they can’t get the coupling and I will get the car in two weeks. I informed him that I want the car today and they must find a coupling. I am escalating this issue to you and request the car to be ready this afternoon 16:30 for me to fetch the car.