Bad service, inconvenience

I sent my car in for repairs on monday at Nissan kempton park as it was booked in for monday. It has been a hassle to get the report that has to be sent for approval. The report was received late yesterday the 11th of July 2019 because the guy that sends it had a breakdown and did not get to work in the morning. Now the report has been approved today and the parts are ordered but will only be received monday afternoon due to nissan processes. I had to wait for a guy to send the report while it was supposed to be sent in the morning on thursday which is not fair. If the report was sent in the morning yesterday then the approval could have been done yesterday and ordering of the parts could also have been done yesterday. Now is it right that I the customer have to wait for Nissan's processes while I am not the one that caused the delay, please tell me. I use this vehicle to generate an income and it is in for repairs because the car had a problem from the time I bought it therefore this again is not my fault. I have already lost a lot of business due to the car being at nissan the whole week I cannot lose more business please. This is very wrong of nissan and I need my car to be ready by today latest tomorrow morning. Can someone hear my cry and help me please!!