How to write a complaint to a travel agency?

Description of the situation and justification

The tourist services you provided have not met my expectations, since <state the reasons why you are not satisfied, e.g.: the air conditioning in the room was not working or the spa was closed>. My expectations were based on your offer. According to it <explain what was
included in the offer and that based on it you believe that your complaint is justified>.

Request and deadline for processing

I request to <specify your claims, e.g. a refund of money in the amount of…>. I am looking forward for your reply to this <letter/e-mail> within 14 calendar days from the date of receiving it.

Yours faithfully,
<first and last name>

Attachments:

• copy of the offer or/and contract
• confirmation of the money transfer or statement from the credit card
• pictures of the room or other confirmation of the existing conditions inconsistent
  with the offer/contract