When both parties sign a contract, they shall perform their rights and obligations in accordance with the contract. If there is no relevant contract, it can be settled through consultation. If necessary, evidence can be collected to support your claim, and you can apply for arbitration or bring a lawsuit to the court.
According to the relevant provisions of the Consumer Protection Law and the Civil Code, the other party may be required to bear the liability for breach of contract or infringement. If both parties agree that the effect of body shaping is not achieved as a condition for refund, I suggest you supplement the written terms and conditions, which is beneficial to you. In addition, it should be noted that due to the particularity of the beauty industry, if you think that the purchased goods are not worth the price, since you have fulfilled the payment behavior, there may be legal claims that may not necessarily support your full refund.