SHOCKING ACCUSATION

I am not sure if anyone else is having issues with car hire companies in South Africa BUT i certaily am. For the past 4 times that I have hired a car I have had a problem. December 2016 we forgot our walking sticks in a car at First Car Rental and they went missing shortly after handing the car back. We called them almost immediatley and no one knew where they were. Vanished! June 2017 we rented a car and the boot jammed for the whole holiday and so we were unable to lock our luggage in the boot. December 2017 we rented from Budget/Avis and the car's petrol cap would not open. We eventually forced it open and had to keep it open for the rest of the holiday! The amazing thing is not one of these car rental companies will apologise and discount for the inconveninece. We have now just rented a car from Tempest in Durban. A week into the rental Tempest got a signal that the tracking device of the car had picked up that there had been a "serious" rear impact on the car. They tried calling us but unfortunately I was driving and couldnt take the call. On arrival at my destination I downloaded my voice messages and got a message from the tracking dept saying they were very concerned about us as the tracking device had gone off. I tried calling them back but there was no answer. Knowing that I was safe and had not been hijacked I did not worry about it any further. I did not know tracking devices pick up on impacts. I returned the car on Saturday 14 July. I complained to Sheldon at Tempest Car Hire King Shaka about the fact that Tempest had given me a car with a faulty tyre as we had a slow puncture for most of the holiday and despite having it checked in Hluhluwe, it continued to go down on and off throughout the holiday. Now here comes the catch......listen up folks.....the car was checked when we returned it and NO fault was found! Yesterday 19July I get a message from Tempest to say that the car had been for an impact assessment and that the car had damages for which I am now liable......yes you are thinking the same as I am..... where the heck did this come from! I am also wondering. Further, today 20 July I get an email from Tempest, a paper trail of a discussion that has been held between colleagues. It went something like this.....the tracking device has been activated and the said car has been involved in a "serious" rear end impact.....the next email read.....and yes the client is still driving the car......next email....so and so please make sure that when this car is returned it is taken for a full impact assessment. The paper trail was sent to me with No "Good Afternoon Miss....the tracking device was activated on your journey and it shows a rear impact please would you explain." Nothing like this...just a paper trail of their discussion about me as the client making out as though I have had a major accident and must be grabbed as soon as I get back....Heres the oddity.....the time at which the so called impact occured we were in Hluhluwe getting the slow puncture checked. Could the taking off of the wheel have activated the tracking device? If there had been a serious impact surely it would have shown up on the body work. On returning the car it was checked and all was said to be fine. I never thought it would be anything different as there had NEVER been a rear impact of any kind! How can the company come back to us 5 days later saying there is damage. THERE NEVER WAS A REAR IMPACT....EVER.....HOW CAN TEMPEST MAKE THAT ACCUSATION WITHOUT ASKING FIRST.