Terrible Customer service and very angry

I'm appalled by the unprofessionalism I am currently receiving from Mango. The whole of last week I've been calling the call centre and there was no response, till today. I personally went to their Kiosk at Cape Town Int Airport and all they could give me was an email to send my queries. I'm taking care of my 70yr old mother who tested positive for Covid-19 and was admitted. She was discharged yesterday from hospital. According to my vacation plans was to fly back to GP tonight at 7pm and now I want to change my booking for a different day but their emails keep coming back as that they cannot view my documents which they require inorder to change the booking. It's now almost 4pm and if they don't respond in time I'm gonna lose my money. It's either they refund me my money so I can take another airline who take good care of their customers or give me another option. I've run out of airtime holding on their call centre lines.