I would go back to the Warranty Dept for a sink trap should be a requirement probably a code requirement. YOu can easily call the county inspection office and ask them. It sounds like the plumbing company did not "disagree" a trap was required, just that they would never install a sink without a trap.
Did the plumber think you redid the plumbing for that sink and took the trap out ?? Does not make sense. I would think the plumber would have immediately fixed the problem and never want you to go back to TV Warranty Dept showing them this plumber installed a sink without a trap. These guys donot want to loose TV work.......and TV warranty will fix almost all issues without question during the first year of home ownership. ...and in this case if it was found to be faulty installation/construction, TV home warranty would repair the problem after the first year. PLUS this is an easy fix!!!
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