i truly hope the next guy you do this to takes a bat to your knee caps. But given your comments here and painfully obvious stupidity I don’t think that would help get the ‘point’ across.
There is no way you could miss that when you were asked about the ‘rust problem’… Did you make a lift or jack available for the customer to inspect the underside? did you even mention the any other rust points or the fact that a frikin MAIN frame rail was split into 10 pc’s… ?