The Immigration Advice Authority (IAA) suggests that you include the following when writing a complaint letter to your immigration adviser:

• include your own name, the service you received and your contact details
• include the name of the immigration adviser that assisted you and the name of the organisation
• explain what you asked the adviser to do and what they agreed to do in your client care letter
• explain what happened with as much detail as possible, including dates
• you might want to include details about your immigration history and your current immigration status
• if relevant, explain what you were charged by the adviser and what you have paid so far
• explain what the adviser has done wrong and how this has affected you
• explain how you would like your complaint resolved, this might be a change of adviser, an apology, a refund or a request for your adviser to carry out further work free of charge to correct the matter
• at the end of your letter you should ask the adviser to acknowledge receipt of your letter within a reasonable timeframe and to use their IAA-authorised complaints procedure

When writing your complaint letter you may also want to look at the complaints section in your client care letter and at the IAA’s code of standards.