Is the second-hand transaction of Taobao idle fish safe? Talk about trading risk.

It's very unsafe, and buyers can't get the protection of consumer rights at all! I just bought a navigation on the idle fish and experienced it myself! Some time ago, I bought a car navigation from a seller named Wang Xiaoheng 1 122 on the idle fish. The shelf is brand-new, has quality problems, and can be returned or exchanged. After receiving the goods, I asked the installer to install them. During the installation, I found a flower screen and a white screen. After contacting the buyer, the seller said that I could return the goods if there were quality problems. I sent it back, and the express message has been sent. Now I think the seller deliberately delayed the time and sent it back to me after the automatic transaction was completed. When I received the goods for the second time, I saw the original machine. When I went to find the installer again, I found it was still blank. Obviously, I haven't changed. I contacted the seller again and asked for a refund. The seller refused to refund, saying that it would only be repaired but not refunded. Navigation sent it back to the seller for the second time, and the courier information has been signed. I asked the seller, and the seller said it hasn't been received yet. After waiting for a few days, the seller didn't see the bad review and hacked me. I can't contact the seller on the platform, and I can't see the comments of other buyers for the time being. Contact the seller by phone and say that the bad reviews will be deleted before the money will be refunded. I asked the platform customer service and can't delete it. Obviously, the seller didn't want a refund and found an interface. He paid the postage and installation fee himself. The navigation seller didn't send it back to you this time Money and goods are empty, and it is useless to report the seller twice. Contact the human customer service of idle fish for many times to reflect the situation. Finally, the customer service said that the transaction had been completed and there was no way to refund it. I can help contact the seller and give it to me. I called the seller again, and the seller said you had a bad review and reported me. I also sent the broken machine back to you. I explained the situation to the customer service of the idle fish platform again. The customer service of the platform said that it was not good to open the inspection in person when delivering the goods, and I refused. I said that this car navigation is an electronic product. Without a professional interface, it is not good to open it. Now that the navigation has been sent to me, SF Express asked me to pay tens of dollars for postage on delivery. The seller clearly told me that navigation was not good. Can I continue to waste my money? Once you are cheated by buying things on idle fish, there is no way to complain and no one to supervise! Consumer rights and interests can't get the most basic protection!