Complaint Review: Volaris Airlines

We ( my husband and I as I need him as a care provider due too my medial condition) paid extra for a no fee changeable  ticket. Shortly before the scheduled flight my lung filled with fluid and my doctor would not permit me to fly. We sent a letter from our doctor explaining why my medical condition prohibited  flying! When we contacted their agents we were told  that the only way to keep the value of our tickets was to schedule another flight.. Our original flight was to participate in a clinical medical trial at a clinic in Cancun and we did not know if/when a second trial would be offered nor did we know when I would be permitted fly. But to comply with the agent we booked a second flight for December 19th and paid an additional fee because the tickets cost more AND WE WERE CHARGED A CHANGE FEE! I spent last week in a hospital with a filled lung and was not permitted to fly. We sent another letter from our doctor. Last night we tried to book another flight to Cancun using our NO CHARGE CHANGE tickets and the flight we wanted in February was the same price as our original flight in November.  Despite having paid you 21728 pesos already we were asked to pay yet MORE for the tickets AND yet another change fee! Alternatively we were offered a 4000 peso voucher on a 21728 investment. This is the most despicable, unethical, airline I have ever encountered and we have filed several highly critical reviews on travel  sites and we will file as  many as possible on other sites  . If we had seen these sites before we bought  tickets  we would never have chosen to fly with Volaris. Volaris consistently has the worst possible ratings for scamming people for more money and dreadful service .