Dua L

This is about the dua L advertiser which I have been writing for. I joined them about a month ago and have written about 7 posts. However I have yet to receive any $$$ from this particular advertiser. I sent them an email, asking about the status of my posts. They told me to check the account, which I did. I know my posts are listed as approved but the earnings are still pending. So, I sent them another email regarding payment. They replied by quoting their FAQ on payment. I know their rules on that but it’s overdue. So, what should I do? Keep sending them emails? I wonder if other bloggers faced the same problem.