Second bad experience in less than 6 months in thi...

Second bad experience in less than 6 months in this Darty. I am visiting on Friday July 28, 2018 to purchase a fan. The first seller tells me that he only has models left at 400 . After going around the department, I came across a 160 model from the Aerian brand. I buy this model, which breaks down after two hours of use. Back at the store on Saturday, I have all the difficulties in the world to get my money back. The workshop employee explains to me that he can only issue a voucher. The department employee explains to me that there is only one exhibition model in poor condition, etc. They walk me around in circles for 20 minutes, emphasizing the 400 model. Tired, I go directly to the cashier "Hello, the exchange is not possible, I am coming for the refund" and it is over. In the end I lost an hour and I went to buy my fan in the lerroy merlin which has just opened.
If this is the Darty trust contract, I can also order online. I do not recommend this store.