Tired of waiting for my money

I would just like to say I am so disgusted by the service provided by mango and so tired of running after them for my money ,with all things being considered with covid hitting worldwide businesses impacted and stuff ive been extremely patient i booked 4 airline tickets in 2020 to fly in March 2020 unfortunately level 5 lockdown was instructed the day before my flights.i.was told i will.be given.a voucher as i couldnt get my money back i advised the airline i was pregnant at the time and i would not be able to travel thereafter with a small baby especially with covid i could not risk my baby getting sick. I was told the voucher will be extended.i was issued new voucher numbers in july 2021 and not even a few wks after mango has been grounded my voucher expires now in april but I can't get into.contact with anyone at mango offices.i need to travel shortly,however i must now pay another airline which i find to be ridiculous as i have 4 outstanding tickets!!! Can mango just give me what is owed to me!!!