Contact
One address, read by a person, for everything: a file that will not open, a chart for a date you cannot express, an order to change before it prints, a refund, a question about what is actually drawn.
If you already bought something, send the email address you paid with — that is enough to find the order.
Answers usually come within a day. Replying to the email that delivered your chart works too: it arrives in the same place.