Sounds like they have got what they paid for Bluey?
I did a regular mowing job yesterday and the owner had decided to spray the bindi himself after I had mentioned it needed doing and offered my service. He used roundup and there are now dead patches all over it. His wife told him off and told him to get me to fix it lol so today I have fertilized, 1 weeks time I will spray the rest of the lawn for Clover, Bindi, Broadleaf etc. then in 2 weeks another mow and top dress and hopefully by the end of summer it will be healthy again