In this article we will provide you a Formal business letter sample to advertising agency, with intention to review the existing contract, company has signed with a firm. Feel free to use it and adjust it in accordance with your needs     Senders Company contact details Date Recipients Company contact details   RE: Contract for provision of Advertising services No. _____ from MM/DD/YYYY   Dear Ms. / Mr. [Last name]     I am writing you in regard to the Contract for Provision of Advertising Services, our Company has signed with [Company name] on MM/DD/YYYY. Thanks to the fruitful and hopefully mutually beneficial cooperation we have experienced significant growth thanks to the services you company has provided in the previous period. Using several advertising channels and Medias for the promotion of