Glasfit Denver - Failure to deliver, constant delays and broken promises

I started engaging with Glasfit Denver from 1st Dec 2017. I requested for a quotation for a glass installation on a new exterior door at my house. The pre-sales process went well, and by 11 Dec 2017 I had paid the 50% deposit and provided proof of payment. I was very much concerned about staff availability through the festive season, which I communicated to Bridgette and she assured me that Glasfit will be available to deliver the work throughout the December period barring weekend and public holidays.

Arrangements were made for the installation to take place on 13th Dec. Glass technician Shadrack came to do the job, but was unable to complete 3 glass panels due to incorrect sizing in the cut glass. A section of the door was left agape, allowing rain through and potentially leading to damage.

I was informed that on the next day Shadrack had taken the correct measurements and would provide to Zack, the man he reported to, who will submit to Glasfit for new panels to be cut. Glasfit office would be in contact with me to arrange for the next fitment to complete the job. However, this did not happen. After not hearing from them the afternoon of the 14 Dec 2017, I had to call Rebecca, who co-ordinates workers from the office, for a follow up.

I was told that Zack had resigned and Shadrack had not reported to work. I was informed they will have someone come on the 15th, but there was no show. I've been following up daily on the 18th, 19th, 20th and today its the 21st December and still nothing has been done. I am constantly promised other workmen will be coming to do the job the next day, but when this falls through and I follow up, an apology is given about the workmen not being reliable and a promise is given to have someonelse come complete the job the next day.

I'm bitterly disappointed and feel I've been taken for a ride. I'd like to escalate this to have Glasfit compete the job asap, this is not acceptable.

What is my recourse as a consumer? What if my brand new door suffers water damage due to exposure to rain as a result of incomplete job?