A garage have been driving my other half's car, out 3 times, one of the occasions it was parked on double yellows for 30 minutes, the garage haven't been much help saying it was just a test drive, it only went in for a suspension bush, they had car from 930 till 1230, and it seems they were using the car most of the time, what should we do

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Forgot to say, it's all on camera