Poor customer service car breakdown

1 Dec called Avis at 16.10 on their 24hour roadside assistance. 7 phone calls later an 2 hours of waiting on the road and they kept bouncing me around from Sunninghill to Sandton as I had a breakdown in Bryanston. 2 hours later they tell me that they still haven't found a car an a driver is on his way to take us to the airport. My fianc?e missed his flight an sending a driver does not resolve our issue. No follow up calls from their side to give us any indication. Unfortunately as I booked the vehicle thru Nestle I had no option but to book with Avis but this will be addressed with our HQ. 2.5 hours an still counting no car nor any updates on how long I have to sit on the roadside. This is the 2nd time Avis has assigned a vehicle to me that has broken down in a year. An all this comes at my own personal time, expense for calls an now a missed flight