seller is dissatisfied with the price sold

[papy_luc]

I am a member who buys a lot at eBay, I love to bid on several items that starts at a very low price, I think this is one of the main activities at eBay. But there is a disadvantage that happens too often in auctions, if the seller is dissatisfied with the price sold, he decides that he does not send the item and he says that the package is lost in the post and reimburses me, or either he sends an item that does not correspond to the description of the item won and he can also want to solve the problem with a refund, in the end we do not receive the item won. I find these ways of doing the seller is very frustrating and I do not believe that eBay endorses this kind of action that I find of a dishonest.
Is there something I can do ? 

Have a nice day

[momcqueen]

"Is there something I can do?"

The only recourse really left to you in a situation such as this is to leave appropriate feedback so that other buyers may be forewarned. 

Or avoid sellers who are setting their opening bids at too low to sell. Any seller who starts an auction these days at 99 cents and expects it to sell for $99 is Living in the Land of Make Believe. Or is very new, naive and inexperienced. Either way, it is a seller best avoided if you don't want your time to go to waste. Even if you get a refund on an item lost or Not as Described, you've wasted time doing so.

As consolation, ebay takes a dim view of seller-initiated cancelled orders and sellers who make a habit of this are penalized. Their days of selling here will be numbered. 

[femmefan1946]

The seller who cancels gets a Defect on his account, which leads to higher fees, restrictions on the number and value of his listings, and eventually eBay closes his account.

or either he sends an item that does not correspond to the description of the item won and he can also want to solve the problem with a refund, in the end we do not receive the item won.

This is a Not As Described dispute.

Your first step is to contact the seller.

• It sounds as if your seller(s) tells you to keep the item and then refund you.

If they don't go to the Resolution Centre at the bottom of this page.

The first suggestion is to Contact the Seller. You've done that, so ask eBay to step in and Escalate to a Dispute.

The seller will be required to send you a Return Shipping Label and to refund you when he gets the item back.
If he doesn't, eBay will refund you and go after him for their money. He gets a Defect for this .