Fidelity Investments interview questions

Very bad interview experience. They had about 5 rounds, and was offered the job. After that background check was all clear. Joined the company and offer was rescinded because the recruiter assumed that i was working for 'X' company which i clearly mentioned in background check other wise the background check would not have been clear. They offered sign-in bonus but i felt like they didn't want to give the sign -in bonus because the recruiter assumed I worked in 'X' but actually i was not. I had shared the same during interview process too that I am not working for 'X'. But to cover up the incapability, lack of experience and underperformed recruiter, they put the blame on me and withdrew offer. Very bad an dunprofessional recruitment team