Tempest Car Hire accepting booking outside their opening times leaving a mother of 2 infants stranded

I made a booking Saturday morning for 4pm pick up and when i call to arrange to get my car earlier to my surprise the branch closed at 1pm i spoke to two different agents and they said it closes at 5pm the opening hours were changed. I call the branch no answer, i call central reservation and i speak to a manger whom i believed would be able to assist, he says the manager at the Randburg branch cant come back to open mind you i had called them at 1:30 how far could the supposed manager have gone in 30 mins. They then say I must make my way to the airport at my cost, why am I being asked to foot a Uber cost of R500 when the error wasnt on my side?! I am a mother of two infants that I have to drive to the Eastern Cape and no empathy was afforded to me nor a viable solution considering it wasnt my fault. I was left stranded frustrated and puzzled. Again how does a branch close without checking if the intended customer is still coming in to collect the car? Absolute worst customer service I have ever received