Telrex has amazing customer service - they are very prompt in responding to emails, sometimes as quick as in a few minutes from the initial email. They are always pleasant to work with and I have had the great opportunity to work with and meet Shannon B in person.
Shannon has even helped us with custom requests on multiple occasions making my job easier and quicker to complete.
I work for a large IT based company in Melbourne and would highly recommend them from a business/enterprise perspective.