Ventana Landscaping

There has been long ongoing issues with work for a company I work with. Once the issues were being brought to Abby, a landscaper for Ventana he became unresponsive. The company billed for work that was not being done for MONTHS. When looking at the work that MIGHT have been completed in the months they were paid, it was halfhearted and haphazard at best. They charged thousands of dollars for irrigation work which there is no evidence of ever being done. Plants have died within months of planting as they were not getting proper water. Numerous attempts to speak with them have been made without a word of a reply. I would never recommend their company for work of any kind. How does a landscaper kill plants they have planted? Isn't that their main job?