DTCC Intern interview questions

Other reviewers for this position (Application Developer Intern) have said they are slow or never get back to you, and it is true. After a phone interview the recruiter told me he was very impressed and would get back to me in a week or two. After that time had passed I emailed them reminding them I only had a few weeks to accept an offer and was told they needed another week or two. No response from them until over a month later when I receive a cold call (no email first) asking me if I can be available for an on-site in 2 weeks time. Seemed very surprised I had accepted an offer even though I told them I had a deadline. Recruiter was very disorganized and only knew details about his local DTCC office in another state and had no information on the one I was applying for (NJ).