Swapped battery at Bosch Car Service Empangeni

Last week I took my car to Bosch Car Service in Empangeni because the breaks were making noise. They advised me that the rear break disks, pads and and front pads needed to be changed. They did not have them in stock and it took them about 5 days to order and fix the car. When i took the car there the battery was working well. When i collected the car the battery was no longer working with clear evidence of tempering (i am convinced someone swapped my battery in the workshop). The clock had reset showing that at some point the battery was removed. I reported to the supervisor who initially was supportive but in the end was verbally abusing me. Now the car is also making a funny noise which was not even before. I feel cheated and feel Empangeni Bosch Car Service must pay for my battery and review what happened in their workshop