Incomplete Aircon Fitting Service

A purchase of 2 air conditioners from Builders Warehouse was a pleasure only to be spoiled by their installation service provider (Foursure) They installed 1 of the 2 aircons causing damage to the ceiling. The 2nd Aircon was installed on later date (21st December) committed time was 11:00. The installers only arrived around 19:00 - I regret allowing work to be done in those family unfriendly times. They left our house just after midnight and promised to return the next day to close the holes created for piping. We have been in contact with both Foursure and Builders on this incomplete work, 10 days later the problem remains unresolved. Foursure keeps promising to come each time we call them yet they remain no show. Our lives are suspended to their wait as they never keep to their time. I warn everyone not to allow this FourSure to do work at your houses outside business hours - in case there are parts to be purchased by yourself and the shops are closed. If they fail to come back to finish their own work, imagine if it due to items you ought to purchase. I'm praying that Builders Warehouse take me out of this misery and hold their service provider most accountable.