Unfortunately, some suppliers do not make it a habit of logging in to their SaleHoo listing regularly therefore causing an email backlog (only for emails sent through their SaleHoo listing)
Other than SaleHoo's contact us button, there are several ways for you to get in touch with the suppliers:
Through the suppliers' contact page- A good number of suppliers have an online contact form which you can use to send your email.
Direct email- Suppliers' emails are typically stated on their listing on SaleHoo or naturally, on the suppliers' website.
By phone- Phone numbers are listed on their profile page here in the directory or you can visit the suppliers' websites to check it out.
Live chat- Some suppliers also offer this type of support and is generally a quick way to get your questions answered.
This is another supplier of Lego:
Link hidden: Login to view
All the best!