PG Glass, how to get hold of them

I have no idea on how the service is with pg glass. My insurance recommended that I use pg glass for a windscreen replacement. Its been 2 hours of phoning several numbers. Used the whatsupp feature, been waiting for more than an hour for a call from an agent which would have been made in 15 minutes according to the whatsupp messages, Silverlakes and menlyn branches in Pretoria does not answer their phones. The 08600.... number from the website, also just rings continuously.