T M review about company American Plumbing & Mechanical

I had America Plumbing out to clear a clogged main sewer line on 8/13/2014. When they arrived I told them the source of the problem was tree roots. They said they ran their snake all the way to the sewer line and the clog was cleared. On 8/28/2014, the line was clogged again. I called American Plumbing back because the receipt stated they have a 90 day warranty and I verified there would be no additional costs. They came back and ran a camera in the line to discover tree roots (which I already told them was the problem). The second time they ran a different snake through the line and cleared the roots. They now are trying to charge me an additional $145 for the second snaking when I already paid $145 for the first snaking that didn't work! They didn't complete the job adequately the first time and offer a 90 day warranty. How can they justify charging me another $145? I cannot recommend American Plumbing Heating and Cooling Inc. in good faith. Avoid them if you can. They DO NOT stand by their warranty. I have receipts to verify my claims. I will contact Google if review is removed.