Lawn Rangers_ instant lawn caries foreign grass species and ****s

After an installation from LM instant lawn by Lawn Rangers of more than 100sqm (with compost), the area is now covered in ****s and riddled with numerous foreign grass species. The rest off my lawn is **** free and growing well, except for where Lawn Rangers planted. Now I am sitting with an issue of removing the foreign grass types and de-****ing on a weekly basis. Lawn Rangers has no interest in addressing the issue. DO NOT USE LAWNRANGERS unless you would like ****s and foreign grass species.