What do you do if a client stops replying after you send an invoice?

[Btaliat]

It is possible for clients to stop replying to freelancers' messages anytime they send them invoices. Freelancers should not take this serious in the first instance. They may consider it as oversight and find other ways to get them reminded. They can send them reminding notes and messages. But if they refuse to reply. The freelancers should hold on to the final copy of the tasks. But they should not disturb again. What do you think about this in the comment.