Am Group Of Companies

AM Group was not true to their words that their service is perfect, even without our presence when the project was done. There seems to be no quality control done over the performance of their sub-contractor. When there was heavy rain and snow, there are leaks in the gutter and the gutter guard, which is part of the contract is NOT there at all. I called the office and sent messages through a group chat. It's been five months since the completion of the project and nothing's been done. I just realized that I need to constantly call this company to get the job done. I'm so frustrated!