In fact, we don't need to believe what the salesman said, because there is no invoice and no corresponding contract. Even if the contract is signed, it is basically impossible to honor it if he doesn't write down what he said and the guarantee in the contract. In this case, we will negotiate with each other. If negotiation fails, we will choose to call 123 15 to solve the problem.

Generally speaking, 123 15 mainly deals with consumer disputes. If you haven't bought this diamond ring for more than 7 days, you have the right to ask the other party to exchange or replace it. If it really doesn't work, you can also call the in-store phone number 123 15, and let the industrial and commercial departments come to negotiate and solve this matter. After all, what they said has not been fulfilled. You can ask the other party to fulfill the promise they said before.