Courrier-type - Refus de demande d'augmentation de crédit

Dear [Mr or Mrs or Sirs], We thank you for your letter of [date], in which you request an increased credit limit on account [références]. We have carefully studied your proposal, but regret to inform you that we cannot accept it at the present time because [motifs]. We trust that you will appreciate our arguments. We look forward to being of continued service to you in the future. Yours sincerely [votre nom] [votre fonction]