Zero accountability for loss as a result of not following customer request

I took my vehicle to Dent Tech Strijdompark on recommendation from the Assessor of my insurance and booked the vehicle in on 09 February 2023. Whilst booking the vehicle in, anticipating that the vehicle might spend a prolonged tome at this repairer, I explained to person assisting me that the vehicle has a battery cut-out switch installed to isolate the battery of the vehicle to protect the battery when the vehicle would be idle for an extended period. I further demonstrated the operation of the battery cut-out switch to the person, who rep**** that they would isolate the battery when the vehicle would be idle for a prolonged time. The vehicle was able to effortlessly start when each time the start button is depressed at the time the vehicle was delivered to Dent Tech Strijdompark on 09 February 2023. On 10 March 2023, Dent Tech Strijdompark contacted me and informed me that I could collect my vehicle between14h00 and 16h30. I subsequently went to Dent Tech Strijdompark between14h00 and 16h30 on 10 March 2023 to collect my vehicle. When the vehicle was presented to me, it was presented to me within their building with the engine running, which was strange to me, but did not expect any foul play at the time. I was told that I would only be provided the vehicle key after signing the paperwork in the office and subsequently went to the office to sign the paperwork. When returning to the vehicle, the engine was still running and the vehicle key provided to me, whereafter I drove straight home, which was a 10-minute drive. When arriving home, I parked in front of my garage and switched the vehicle off, before opening my garage. When I wanted to start the vehicle to park it inside the garage, the vehicle refused to start due to low battery. This was strange to me and I thought that I would just charge the battery and all would be fine. I was sadly mistaken, as the battery refused to charge and found that it had a dead cell, when I took it to Midas for assessment when the battery did not want to charge. I sent an e-mail to Dent Tech Strijdompark informing them of the problem,but did not receive any response. I subsequently phoned Dent Tech a day later and was informed that someone would phone me back, but nobody phoned me back. Two days later I decided to pay Dent Tech a visit and was then told at the reception that they are working on it and will revert back to me. To date nobody from Dent Tech Strijdompark ever phoned me back. I believe that Dent Tech Strijdompark never isolated the battery of my vehicle, as I requested and allowed the battery to become fully discharged in the month that the vehicle was with them, but are not honest to acknowledge their fault in this regard. I have also asked my insurance broker for assistance, but Dent Tech refuse to engage in discussions and only say that a vehicle battery is an item that can fail anytime and that it doesn't concern them, irrespective of the fact that the vehicle started effortlessly every time when it was booked in for the repair. Even suggestions to evenly allocate the replacement between myself and Dent Tech Strijdompark were dismissed, with Dent Tech Strijdompark not willing to enter any discussion on the matter between me and them or my broker and them.

Could Hellopeter kindly please assist me in this regard?