Complaint procedure for visit visa to UK 6 month [duplicate]

Nope, there is no standard procedure to appeal or complaint against a standard visitor visa refusal for UK.

Refusal letters clearly say:

In relation to this decision there is no right of appeal or right to administrative review.

Generally, there is no right of appeal for visit visa applications. However, that does not mean that ECO's have no accountability. You still have two options:

• Ask the ECM for a review. If there is an obvious error made by the ECO (such as reading the numbers on the application form wrong), the ECM will be able to overturn the ECO's decision. My friend was successfully able to do this. In the refusal notice, the ECO had referred to parts of the application which were materially different from what was actually stated.
• Judicial review. If you believe there has been an error of law, such as not following the proper procedure, you could be able to get the decision quashed through a judicial review. However, you would need a solicitor and be prepared to bear the expenses. Normally, a second application would be a better choice.

Depending on why you think the decision was wrong, you should also contact the British Embassy/High Commission in your country, the decision making hub, the independent inspector for the UKVI, and any other relevant bodies that you think could make a difference.

Edit: The OP has posted a copy of the refusal notice. While the refusal may appear unfair, I don't think the remedies above will help him much. The ECO is concerned about the two large deposits in the OP's account and while the ECO does not outright accuse the OP of deception, he thinks the documents submitted cannot be considered evidence. The burden of proof is on the applicant. He has to prove he qualifies.

A second application would be the way to go. To show the origin of these funds and depending on what exactly was sold the OP could produce:

• copies of the cheques used
• vehicle registration documents (in case of a car)
• property transfer/registration documents
• any other documents that can be verified independently

You can NOT ask for a review because your application is excluded from review per the link below.

Ask for a visa administrative review

If you're outside the UK

You’ll be told in your application refusal letter if you can ask for the decision on your visa application to be reviewed. This is known as an ‘administrative review’.

You can only ask for an administrative review if all of the following apply:

• you’re outside the UK
• you applied outside the UK
• your application was refused on or after 6 April 2015
• you don’t have a right of appeal against the refusal
• you didn’t make an application as a visitor or a short term student

How to apply

You must apply for an administrative review within 28 days of getting the decision.

You’ll either get the administrative review application form with your application refusal letter, or you’ll be asked to download it.

When you get the form you must:

• enter the reasons for refusal that are on your decision letter, and say why you think a mistake was made
• send your completed form in the method the application refusal letter suggests (by email, post or in person)

The guidance notes tell you how to fill in the administrative review application form.