I was informed that my approved immigrant visa petition was returned back to the USA because I could not attend the immigrant visa interview at the Consulate in Ottawa (which I could not because I was abroad). After contacting the IV section at the consulate to reschedule the interview, they asked me to re-submit the DS-230 and mentioned that "the machine" (sic) would assign a new interview date in about a month or so.
However, four months have passed without news. I suspect that my approved petition was sent back to the USA and now is being reclaimed by the Consulate. Does anybody know how long usually this process takes? Does anybody have any idea of possible problems that could arise?
Thank you very much in advance!

