Defy ill-informed staff

My name is Fatima Fredericks. I called the Service Centre on *** two days ago and spoke to a guy by the name of Damian to arrange for a technician to repair my Defy Auto**** 600 which has become very noisy. I bought it new over 10 years ago. He quoted me R630- for the callout and I accepted the quote. However when the technician called yesterday before his arrival he said he was on his way to me to sort out my tumbledryer. I obviously corrected him and said I booked a technician for my washing machine. On his arrival when he saw the machine at first glance, he said parts on my machine are no longer available and the machine has been discontinued. My heart sank to my feet since he said I still have to pay the call-out fee of R630- although nothing could be done to the machine. I called Damian after the technician left and told him the technician says parts for my model washer is no longer available and I asked him why he could not convey this to me when I called. He then said he did not know the parts on my model machine are discontinued. My question is why on earth you have staff in that position who cannot advise clients. He has promised me that he will speak to his Manager and call me back since I am very unhappy about paying R630- for nothing. He was going to call me back yesterday and since I did not hear from him by 16.15 today I called again but Nathan answered and said Damian was busy on another call. I have left a message with Nathan for Damian to call me and left my cell number again. I am still waiting. Please advise. Thanks