Bad service at Land Rover menlyn

I took my car in for service on the 24th April 2024 at Land Rover Menlyn, when I got there I explained to the service consultant what issues I had with the car that needed to be checked. Later that day I called them to ask if the car was done and asked why I didn’t get any feedback and they told me they are still busy with the car I will get it Friday. Friday I get a call that the part required to repair the issue has to be ordered in London and they arranging a car for me, only to find out that I have to pay a deposit for the car hired which is an expense I didn’t prepare for; I then explained to them that I need a car as my job requires me to travel to remote sites. They insisted that they don’t have cars to lend and I have to take the rental and pay the R2000 deposit, I have had the car for over a car now but I can’t travel to remote sites as we need SUVs or 4x4 to travel on our sites. So the car was hired for 7 days and today they call again saying they’re coming to take it and I have to pay another R2000 to get another hired car.how do I resolve this?