I used Sam's Local Plumbing (also known as Your Local Plumbing) when my drain got blocked and was totally ripped off. They charged me over $1000 for a total of about 1 hour's work to run a high-pressure water jet through my drain and a camera, which didn't clear the block at all. This was my first time using a plumber and I blindly trusted their pricing and advice. They then quoted me an extra $3000+ just for finding the location of the block. I instead got another plumber around, who found and cleared the block in about 20 minutes (it was a short distance in, at the bottom of the boundary trap) and charged me around $200; their minimum one hour fee. He said the block should have been located easily by the 'other' plumber. I then asked Sam's Local Plumbing for a refund but they refused. I took the matter to my state's tribunal service (VCAT) and won a full refund but they still wouldn't pay. I would suggest to anyone else that was ripped-off by this company to try their local tribunal service too.
Don't just take my word for it, look for the (genuine) 1 star reviews on Yellow Pages which tell similar stories. Avoid at all costs!