Complaint Review: Clarke Kent Plumbing

We had a terrible experience with this company and would never use them again, or recommend them to anyone.    
Our gardener pointed out a leak in the concrete on one side of the house.  We called Clarke Kent plumbing and they came out to take a look.  Not only did they take 6 hours to inspect the leak, they told us the only way they could figure out where the leak is is to use a "carbon machine" which would cost us $550.  if they didn't find the leak, they would expense this.  However, if they found the source of the leak, we would pay for this. 
Desperate and admittedly ignorant, I said yes. 
They went out to "buy" this machine, came back, and confirmed the leak to be in the bathroom sink.   Then they said they would have to tear down the wall, run a new line, all in all it would cost $2000 just to open the wall and another estimated $10 to 15,000 to run the line depending on what they found.  We were shocked.

Cut to: we called a leak detection company.  paid $475 for them to detect a leak with hi-tech equipment.  They found leak in our toilet sealant,  gave us a video of the detection for our records, and said it would be an easy fix estimated around $200.

We called Clarke Kent and asked to be reimbursed for their misdiagnosis.  They came, they made all sort of excuses, now they refuse to get back to us on anything.  They asked for all our receipts and said they would get in touch with the company that fixed the leak to figure out what they did.  In short, it has been months and still no response to any of our calls.

We feel they are totally incompetent at best, corrupt at worst.  Beware before considering them.