Product Has Broken Please Service under Warranty –
[Name, Company Name & Address here]
We want to inform you that the [product name] you installed in our building on [date], is not working properly.
– [Describe the errors in brief].
So, I am seeking an appointment for free service under warranty. The warranty card no. is [no. here]. I have enclosed a copy of this card, and the sales receipt along with this letter.
You can call me on [no. here] for setting up the appointment.
Encl: [Enclosures List here]