The Consumer Protection Act, B.E. 2522 (1979) with the first amendment of this Act, B.E. 2541 (1998) provides the consumer rights as follows:
Consumers have the right to receive information from the business entity through advertising or labels.  This includes the right to get enough information about the goods or services to avoid misunderstanding.
This means that a consumer can willingly buy goods or service and without any unfair persuasion.
It is necessary that the goods or services be in a good condition and quality. It must meet the right standard so that there is no harm to the life, body or property of consumers when used according to its conditions and to the instructions.
This is the right to have a fair contract from a business entity. It must not contain unfair terms affecting a consumer. For example, a credit card agreement which has terms. Terms which allow changes in the conditions of the card usage fee, service charge, accrued interest without prior notice, as well as a term which allows a business entity to abolish the contract on credit card usage at any time without any notice to the consumer. Finally, no term which indicates the right of the consumer to cancel a contract.
The consumer has the right to call for compensation if the consumer suffers damage caused by the business entity. Therefore, the consumer can make a complaint for help and support at the Office of the Consumer Protection Board or relevant agencies.
The Consumer Protection Act mentions that goods and services advertisement must not contain a statement which is unfair to consumers. It shall not be affected by a method which may cause harm to health, or may cause physical or mental harm or annoyance to consumers.
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The following statements shall be regarded as those which violate this Act:
In case the Committee on Advertisement has a reasonable ground to suspect that any statement used in an advertisement is false or exaggerated, the Committee on Advertisement shall then have the power to issue an order requiring the advertiser to substantiate the claim.
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Given these points, any businessman who is doubtful whether his advertisement will violate or does not specifically conform to this Act may apply to the Committee on advertisement for consideration and opinion, or to clarify on such matter before advertising.
Reference: A Handbook for Disseminating Knowledge for Consumers – Office of the Consumer Protection Board