I have had the same experience: found a super low airfare, booked it, then received a message to call their agent. Upon speaking with the agent I was informed that it was a non-refundable ticket, no online check-in, no seat selection as well as no personal item, no carry-on nor any checked luggage. The agent seemed helpful and "called the airline" to upgrade my ticket to accommodate checked luggage—which I was then informed would cost an additional $600 EACH WAY for my $860 round trip ticket. Definitely a scam! I promptly locked my card (no charge appeared yet), and will keep monitoring any further activities.