No customer service

I've lodged a claim for a windscreen replacement, I chose PG Centurion as the service provider, I've never been so frustrated in my life. The service is horrible and you never get through their phones. I then called my insurer to change providers, which the consultant asked me to give them one more chance. The manager then called me and said they will come and install the windscreen last week Thursday, to this date, I haven't heard from them and have decided not to go with them anymore. PG Glass is the worst service provider.