Travel holiday went wrong

I'm truly disguted by the service I'm receiving from Flight centre Wonderpark offices which has since been closed. I was assisted by Lesley in February when I booked my holiday which due to covid-19 I was informed that Mango is refusing to refund however can offer vouchers. To my dismay I have not received my voucher no one knows what happened with my voucher, Lesley who was helping me informed me that he was laid off and no longer working for Flight centre and I had to deal with Floyd who referred me back to Lesley who is apparently handing over. I've had conversations with Lesley he has informed me that he still waiting for Mango who has not responded to his e-mails, I'm really getting annoyed and drained by the back and forth from Flight centre. I requested for a managers contact details Lesley said he will find out for me I'm since waiting for his feedback. If they cannot provide my vouchers can someone please refund me I will arrange my travel with another company. This is is terrible service and it has created a lot of distress for me.