No way to reach them, have to drive to a branch and try your luck in person

Tried to contact PG Glass Midrand, cannot contact them directly - need to go via Call Centre - tried the call centre 3 times, on hold permanently, no answer. On selecting the option to leave a message, the auto response says that the mailbox is full... indicating that this is a problem to everyone who phones. How do you expect to do business if your customers can't reach you. How do we as customers trust all your promises of convenience on the call waiting recording... if you can't do something as simple as answering a phone? Horrible experience!