Poor customer service

I ordered my custom made shower glass due to initial good service, their lead time states 14 - 21 days and Claudio phoned me earlier when I was not ready for installation. I told him my area for installation will be ready from 5 or latest 6th of March and I was promised a call back on Monday the 5th of March to arrange installation for this week which didn't happen and I made contact on the 6th to arrange when I was told they cannot assist due to the installations already booked. I have paid for installation yet I need to wait when its suitable for the company and when their installers are in my area. I will not recommend them to anyone as I am getting serious attitude from the highest level of management. No customer service!!