Well, looked 'em up and it looks alright.
First thing I would suggest is checking - are/were they even open for quotes? Not all makers are open to just submit quotes like so but only actually accept them at specific points when they specifically have stated they are open for them.
Also, I checked their twitter and saw this posted just a week ago:
"Hey everyone we are back from con catching up on emails and customs this week. Please send me an email if you have any questions "If you're having trouble getting replies to emails, consider trying to message them at some other way, such as sending them a message on Twitter or something?