Hope this email finds you well.
We understand your frustration in regard to the late payment. On our part, we are doing our best to settle it. However, we would like to refer you to the issue that caused this situation. It is the matter of non-payment from our clients that we dealt with.
That said, we refer you to payment-related provision of our Terms & Conditions for Publishers that you acknowledged and agreed to in the beginning of your cooperation.
We value cooperation with you and so we are paying 20% of the total pending amount, which is $329.00. We are not getting paid for any of the installs from your traffic. Please send your invoice.