[Your Name, & Address here]
[Recipient Name & address here]
Sub – [write Case name]
Case No. [Case no]
This is in reference to the amount extension telephonic conversation we had on [date].
As you have happily granted me an extension of [extension amount], within which to act in response to the total dues [discovery documents name] in the above-mentioned matter.
As such, the responsive pleading falls due on or before [insert new due date].
Thank you for your professional consideration and, support in this matter.
Encl: [Enclosures List here]