Pathetic service

I rented a car from Avis from 6 to 10 February 2018. Today (2018/02/13) I was informed via SMS that I can download my invoice. I need this invoice to claim back my expenses from the company that employed me. According to the Avis system the RA reference is unknown. When I called Avis Preferred Loyalty on ***I was informed that it will take 72 hours up to Friday (2018/02/16) to get my invoice. This was unacceptable to me and therefore I called the Avis branch where I rented the car. They informed me that I takes 48 hours after the car is returned, but that weekends do not count. Therefore the invoice will be ready after Tuesday (2018/02/14). This service level is just not good enough in the modern electronic age we are living in!