Justlfly.com name not given-and honestly I believe the customer service was offshore as the party sounded like a robot Scam Artist Internet

I booked a flight through Justfly for my husband and I to take a vacation to Cancun October 3rd back in July.  Due to recent hurricanes in the Atlantic and the 8.5 earthquake in Mexico recently, and the travel warning I was reviewing our vacation plans.  I called Justfly to see if we could adjust destination or dates due to these concerns.  According to JUSTFLY the airline, Interjet would not allow destination to be changes and if we wanted to adjust dates that there would be $173.00 penalty assesed for each passenger.  (note the airline tickets for both us was $558.00)  

I called Interjet to discuss this situation and they advised that they did not believe this to be the case-however they could not see the arrangement in their system and would transfer me to another party within Interjet- on hold 30+ minutes - I called back 3x and smae response.

Who is lying?  What type of customer service is this?  Our state department has recently issued a travel warning and I am unable to make adjustments for my safety.