The support staff and their supervisors were unwilling to issue an "Out of Sequence" ticket to an existing booking. They gave me the run around in having me call the airline and call JUSTFLY support several times without any results. JUSTFLY.com suggested to cancel and purchase a new ticket which was seriously not economically feasible.
Lufthansa states that issuing an "Out of Sequence" ticket for an existing reservation is permitted without any fees, but the ticketing agency must issue the ticket.
I was on the phone for almost 7 hours with no results.
The situation is this: I purchased a round-trip ticket to Moscow with the dates beyond my visa stay and now I find I am ordered to leave Russia at the end of my visa and unable to catch my flight which goes from Moscow to Frankfurt then Frankfurt to home in the U.S.A.
An "Out of Sequence" ticket allows me to catch my flight in Frankfurt.