When writing a letter to inform a customer about a delay in service, it's important to maintain clarity, politeness, and transparency. Clearly state the reason for the delay and provide a revised completion date. Express regret for any inconvenience caused and assure the customer of your commitment to minimize the delay.
Sample Letter to Customer Regarding Service Delay
From,
__________ (Sender’s Details)
__________ (Company Name)
__________ (Company Address)
Date: __/__/____ (Date)
To,
_________ (Customer’s Name)
_________ (Customer’s Address)
Subject: Delay in service _________ (details of service)
Dear Sir/Madam,
In reference to your order________ (order no.) dated __/__/____ (Date) for ____________ (service description), please note that due to _______ (sudden unforeseen circumstances / delay in supply of material/ damaged spares received at site/ material damaged during shifting/ material damaged during installation/ other reason) there shall be a delay in execution of work.
We expect the revised completion date to be around __/__/____ (revised completion date).
Assure you that the delay due to the above reason was beyond our control and we shall make our sincere effort to expedite the work to minimize the delay.
We regret the inconvenience caused.
Warm regards,
_____________ (Your Name)
_____________ (Designation)
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Kshitij Tarun 
Yukant Anand