Hi, I hope you are referring to the closure of the CUG mobile number issued to an employee on behalf of the company. There is no standard format for such letters. Like the way you posted this question in this forum, you can write a simple letter to the service asking them to deactivate services for the said mobile number. Please refer to the template below and edit as per your requirement.
Draft
Date
To, The Customer Relation Manager, [Name of Service Provider], [Service provider's address]
Dear Sir/Madam,
Subject: Deactivation of postpaid connection number [Insert Number]
Ref: [Company Name] CUG Connection
With further reference to the above, we would like to inform you that we are no longer using the mobile number issued to one of our employees subsequent to his resignation and relieving from our company.
We request you to kindly deactivate the aforementioned mobile number. We have paid all pending amounts and bills up to date. We kindly ask you to do the needful at the earliest. For any queries, you may contact me at my alternate contact number.
Thank you,
For [Company Name]
[Signature] [Name] [Contact Number]