Ecovacs Robot - Gshopper does not accept return of non-working product

I ordered the robot Ecovacs DEEBOT T8 AIVI, that does not connect to any phone and so it does not work. I wrote to the Gshopper I would like to return it. A asked what is the procedure to return the product. They respond I should provide some videos that better specify the problems I mentioned. So I provider the proof that robot does not connect. They provided the password but the robot did not connect.
I turned to Ecovacs help center ([email protected]) and they said that the device is probably not made for the European market. That is why I’m having problems connecting it.
I said I want to return it because I have been working on the connection for two weeks and I have already tried all possible options, but the robot does not work.
I waited for more than a week (every day asking what is going on) and they provided a new code to connect. I had to register the robot through their password (not through my email) and through China mainland (not through a European country).
Well, the registration was successful. The robot started mapping. It worked for 10 minutes, then it stopped and gave an error: the bumper is stuck. Please push the bumper gently. The robot reports the same error every 2 minutes.
I wrote again on Gshopper that I want to return the product because it doesn’t work. They again asked for the evidence I provided. I have been waiting for an answer for 14 days now.

This is the worst online store ever!!!
Do not buy from them because it is a scam!!!!!