Horrible service by Mango Airlines

The service received from Mango has been terrible to say the least . I requested a voucher for a ticket that is scheduled for this coming weekend . The voucher was requested on the 1st of October via email and has subsequently been followed up by 3 telephone calls with no luck. The 1st lady on the call said the voucher will be emailed in 48 hrs and that 48hrs elapsed , when I followed up I was told about a form and got cut off . Just now I spoke to a very rude operator who told they are offline and theres nothing she can do , when I asked to speak to someone senior , I was placed back on hold and I have been holding for over 30mins.

So frustrated and so disappointed.