Poor communication and customer service

I am a returning customer to PG Primador where I previously received good service and quality products. I recently ordered aluminum windows from them again and have been terribly disappointed in their customer service. Today is business day 18 and I'm still waiting for my windows to be delivered which was promised in 12-15 days, now holding up my project. Unless I contact them, communication is not forthcoming. Promised call-backs, do not happen. The April public holidays are understandably challenging, but at least some communication would be helpful to plan. Their challenges with couriers/delivery staff are made my problem.