To,
Customer Service Manager,
___________ (Name of the Company),
___________ (Company’s Address)

Date:__/__/____ (Date)

Subject: Cancellation of service

Respected Sir/Madam,

I would state that my name is _________ (Name) and I have been using your ________ (Mention service) services for last _____ (Duration – months/ years) having ________ (reference number/order number) from_________ (Date) till _______ (Date).

I regret to inform you that I will not be needing these services anymore and I request you to kindly cancel my ____________  (plan/ subscription). Kindly, consider this as a cancellation notice and help me out by canceling the same at the earliest. Also, I am also enclosing a copy of the invoice for your reference.

I shall be highly obliged for the same. Looking forward to your kind and positive response.

Yours Truly,
_____________ (Signature),
_____________ (Name),
_____________ (Contact Number)