I want to express a complaint related to your horrible service. Upon arrival at the Cancun airport, reservation WDQ2PD on Tuesday November 30,2021. By giving Frontier Airline agents our reservation WDQ2PD they notify us that we could not travel to Chicago since they could not find our reservation. The Frontier Airline agent advises us to contact Volaris to notify them that the WDQ2PD reservation was incorrect. Had to call Volaris right in the spot. After about 10 minutes, talking to the Volaris agent, he informs us we CANNOT travel from Cancun to Chicago that we needed to go MXDF and leave MXCD at night arriving to Chicago at midnight. We absolutely did not accept. The Frontier agent asks me to speak to the young man from Volaris to explain that there were 17 seats available that he only need the confirmation number from Volaris. The young man from Volaris insisted that he cannot give us the confirmation number since we must travel to MXDF and from there to Chicago. Me, with diabetes type two. After pleading with the young man from Volaris, he did NOT help us and hung up the phone on us. The young man from Frontier airline info I want to express a complaint related to your horrible service. Upon arrival at the Cancun airport, reservation WDQ2PD on Tuesday November 30,2021. By giving Frontier Airline agents our reservation WDQ2PD they notify us that we could not travel to Chicago since they could not find our reservation. The Frontier Airline agent advises us to contact Volaris to notify them that the WDQ2PD reservation was incorrect. Had to call Volaris right in the spot. After about 10 minutes, talking to the Volaris agent, he informs us we CANNOT travel from Cancun to Chicago that we needed to go MXDF and leave MXCD at night arriving to Chicago at midnight. We absolutely did not accept. The Frontier agent asks me to speak to the young man from Volaris to explain that there were 17 seats available that he only need the confirmation number from Volaris. The young man from Volaris insisted that he cannot give us the confirmation number since we must travel to MXDF and from there to Chicago. Me, with diabetes type two. After pleading with the young man from Volaris, he did NOT help us and hung up the phone on us. The young man from Frontier airline informs us it will cost us $ 2,336.66 one-way tickets to get home. After more than an hour of insisting / desperation agony about what to do, we had NO choice but to buy the most expensive tickets for three adults