I have checked their site and they are still in business.
Remember that like all businesses, suppliers do close at night and during the weekends. Most suppliers operate 8am-5pm Monday to Friday.
Phone is often a much more effective way of contacting suppliers than email. Suppliers often have a backlog of support emails to deal with, so it may take a few days for them to get back to you. Whereas with phone, you get priority straight away.
If the supplier still hasn't contacted you after 3 business days, please let us know again so we can contact them for you.
Hope this helps.