Poor service provided by Imperial Toyota Parktown

On the 16/02/2018 my car went for service and was assisted by service adviser Vincent, I told him that my inside door handle was not opening which he promised to look at it. When I collected the car he told me that the door handle was refitted and was not charged for it. A month later the door handle was again doing the same problem of not opening inside I went back to Imperial Toyota Parktown on the 15/03/2018 spoke to service adviser Songezo as Vincent was not in which again he asked that the booking should be made. After the booking the invoice stated am supposed to pay R449 and on the 16/03/2018 the day for booked serviced the guy assisted me said I should wait while he check if I will be charged he opened the panel and returned the car saying the door is fixed and the adviser on the day didn't even tell me what exactly was wrong. On the 23/03/2018 the door again not opening which now am confused whether to trust them.