[l-Date]
To:
[r-Name]
[r-Address]
From:
[s-Name]
[s-Company]
[s-Address]
[s-Phone]
RE: [s-Reference]
Dear [r-FName]:
We regret to inform
you that we are unable to grant you a time extension for payment of
the above-referenced invoice.
Please remit payment
on or before [s-PayDate]. If not, we will have no choice but to turn
this matter over to our attorney to collect the amount owed.
Thank you for your
cooperation in this matter.
Sincerely,
[s-Company]
[s-Name]
[s-Title]