No service

I booked a flight for today a month ago with Mango and have been trying to contact them for more than a week via phone and email but received no service. I changed my flight online for another day but my funds/fee to rebook was returned to my account and I was unable to change my flight. The flight is for my elderly mother, I wanted to change the flight for later in the year because I was afraid to expose her to the new covid variant right now. I tried contacting them but the phone call gets cut even before I get to speak to anyone when I finally got through they were offline and couldn't assist, I tried emailing as well but received no response. I refuse to have my payment for the flight forfeited I demand a refund since I have tried persistently to get hold of someone at Mango I even tried to rebook online with no success. I am unable to do anything further online. I have tried on my end but received no service from Mango thus far. It is weekend and their call center is closed and the flight is for today. Super frustrated with Mango.