Horrible Service from Mango Vouchers Department

My initial email to Mango airlines was on the 24th March 2020, Ever since then I have called I have sent follow up emails and up until today i still dont have my voucher and I need to re book my flights. I called again yesterday, provided three different email addresses to them to send the voucher on and still today I do not have my voucher. Today I have been trying to call Mango since 10am, 2hours later I still cant get through "all our agents are busy for 2hours" my ref is TKDZZC can i please have my voucher of just give me my money back. This is unacceptable and also no one responds to my emails they just ignore them. Send my voucher on *** or just refund me I will book with another airline, my holiday is in tow weeks and I still don't have flight tickets because of you guys