Just their way of showing not interested. And it also means they have jobs line up for them already for many months. Didn't take your work also nevermind.

U just need to continue finding other contractors that are not that busy.

And for u if u want answer, just call them and ask direct. Want to do or not. Don't WhatsApp WhatsApp for all these kind of things. They are kinda busy people u think everyday can remember to call u see WhatsApp