Incomplete work that damaged my property

Curbscapes of Atlanta, LLC contracted with me to install decorative cement borders around my flower beds and a decorative cement platform for my garbage cans. They promised to be responsible for any sprinkler heads that would need to be moved. Not only did they not complete the promised work (they never sealed the cement); they also damaged my sprinkler system and have ignored my repeated phone calls and emails about the problem. The only person who has been in touch with me has been the installer and he has repeatedly (at least 8 times) promised to fix the problem and then just never shows up to do so. I am now going to have to hire someone else to repair the sprinkler system. I find their behavior most irresponsible and unprofessional and I would not recommend them to anybody.