Is it considered cheating in weights and measures if a person sells a used mobile phone at a certain price, and if the buyer returns it, he reduces the price?

Question:
The Honorable Shaykh, may Allah grant you success, says: It is common among mobile phone sellers that if you buy a used phone from them, they sell it to you for a certain price. It is common among mobile phone sellers that if you buy a used phone from them, they sell it to you for such and such a price; if you are not pleased with it and want to return it to them, even on the same day, they buy it from you for a very low price, then sell it to someone else or to you again for a higher price. Does this fall under cheating in weights and measures?

Answer:
Yes, if the phone is used, and he claims it is new or unused, and sells it to you for a high price while it is used and its value is low, this is cheating people in their goods. This is cheating people in their goods. He should not buy it from you because the sale was not valid in the first place. He should not buy it from you; you return it and take the money, or he does not reduce the price for the defect in it. This is called the compensation for the defect. So either you keep it and take the compensation, or you return it and take the full price. He should not sell it to you in a way that involves a reduction. Yes.