Thanks for the advice. You're probably right, but still they admit that the product is under warranty, they ask me to send it to them for repair, they say that

Thanks for the advice. You're probably right, but still they admit that the product is under warranty, they ask me to send it to them for repair, they say that the product has some unspecified "mechanical faults", which they are unable to sort out, and only then they start to pretend that the product isn't under warranty, because their "technical service" is currently focusing on a different line of products they say. (What kind of pathetic excuse is that?) At the very least, it's completely unprofessional.