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If you sign for it, it's hard to say.
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It should be possible to change it, but it will definitely not work if it is returned.
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Isn't it a seven-day unconditional return?
This is one of the disadvantages of buying online shopping, so it is very difficult to get a refund if he is not able to fully satisfy you.
2600 + 2600 1 10 = 2860 yuan.
It's best to negotiate with the owner first, and if you really can't communicate, give a bad review, give it many times, and it will always take care of you.
If there is still no logistics information, you can apply for a refund, the reason is not to ship the goods at the agreed time, the seller will not only have to refund your payment, but also refund 30% of the liquidated damages, if you do not return, you will complain.
This depends on what brand, you can go to a treasure to search and compare the price.