I have.
The story is as follows (and i WILL use the company name, as i was successful in court).
I blew the rack in my VP, so i took it to Profix Pooraka to be fixed. cost about 1000 all up for the new rack and labour. So i pick my car up, thinking all is good, pay the bill and i'm on my way. I get about 5k's down the road, and see smoke coming from the bonnet. Pull over. Blown again and power steering fluid everywhere.
I rang him up and told him what happened, and he said bring it in tomorrow to fix it. I thought awesome, he's going to fix it for free. When i went to pick up the car, theres a bill for $1200. I laughed, the worker behind the counter didn't. I told him what happened, and he said he can't let the car leave without payment. Not wanting my car to be there over night, i payed him 500 to release the car. Went down and filed the paperwork to get my money back.
Court date rolls around, judge only needed about 3 minutes to decide in my favour, and he was made to pay back the 500. He then claimed bankrupt, so i didn't see a cent. But, theres ****all you can do legally. I'm sure karma will get him sooner or later.