Car problems after service

Firstly i took my car to Renault in Rooderpoort and they left the deep stick inside. My colleagues told me not to use that place again. Then since the car is in Pietermaritzburg so i used that side to service the car. Started having problems right away . I bought a battery in 2020 now its damaged. I managed to get another one and its also damaged. Now im using someone else's battery and when we informed renault they said we must bring the car and they will check it. They checked and they said they is nothing wrong with the car i must buy a new battery again. Question what if it gets damaged. Now i must pay R400 to fetch the car from them for checking it