Merchants who don't bid will not change. It depends on what kind of store it is. If the store has a good relationship, it may be changed for you. It is almost impossible for big stores. They only recognize that the price is not there and there are traces to follow.

The general requirement for returning goods is that the tag is there, but it is not worn. Generally, if it is marked off, it will be rejected.

Another method is to hang the label, depending on what material the label is made of. If it's that kind of rope, there's no way to die If it's that kind of plastic, you can hit it with that tag gun.