Customer had a backyard full of weeds and some common bermuda (wire grass) which he wanted to keep, as he has sodded the front yard with tifway. Common started it's green up and was probably around 10% green (mainly beside the asphalt road and the foundation) but had a long way to go. There was an accessive amount of fescue clumps, henbit, and some type of tall gabbage looking weed with yellow flowers. At any rate, the customer wanted me to do the job as quickly and cheaply as possible. I sprayed glyphosate (round up) at a rate of 1.5 oz per 1000. I informed the customer of what I was spraying, since he asked, and told him that some of the greening bermuda may yellow but would not die. Got a call from him a week and a half later telling me that I have killed his entire lawn. I tried to explain to him that the bermuda was not dead and that everything would be ok. It took me another week to get out there and look at everything and he was still stuck on "you've killed my lawn - I did my research online", as I walked over his lawn and the bermuda was already greening back up - not to mention we had a frost 2 days after I sprayed. Anyone have any ideas on how to handle this guy. Should I do any other work for him if he calls (as I'm sure he will).