Damaged property

They damaged the battery on my husband's car. We had purchased a new battery for R2,3k a day before we took the vehicle for repairs, now they want to give us R1,8k or replace the battery (hopefully with a new one). There has been a lot of back and forth for over a month and still no battery. They say we have the battery only to find that they purchased a smaller one. The inconvenience is ridiculous. If you plan on taking your car to them, say a little prayer that they don't damage your property as it's a nightmare for them to sort it out.