Poor customer service

Worse company ever, they came to do maintenance on our pool we had a new pool pump installed, for a registered company they did not install a outlet pipe wen why installed the pump,which means we could not drain our pool, after much back and forth they eventually sent someone out to install a outlet pipe, bear in mind our pool was in full working condition before they sent the guy to install the outlet pipe, he installed the outlet pipe without checking if it's working and if the water will drain, low and behold the outlet was not working and our pool was left in a non operational state after he left, now they refuse to send out the guy to fix his mess and they threatening us with lawyers to get away with fixing there mess, they do not answer there phones and do not reply to your messages and then they get angry when u as the client get frustrated for there poor service, it's been almost 2 months after they installed our new pool pump and now we are sitting with a non operational pool due to there negligence, very very poor customer service.