Performed a 30 min phone interview on a friday which resulted in the hr considering me a strong candidate,to be told on tuesday that the role has been already filled

Had an initial call with HR than proceed to present a case and also onsite interview with the Product owner and a manager. What was interesting is that the role was not really thought after! they didn't know what they want from this role, so the time I spent on case was completely wasted. Also there was clear disinterest from the product owner of the domain to have someone with English language speaking. overall felt very tense during interview and could not wait to leave.