MANGO'S CUSTOMER SERVICE SUCKS!!!

After I've cancelled my mother's flight ticket twice in two days, I'm still waiting for the voucher to be sent. Both these agents said that they will email me the voucher already last week and as it is the norm in SA, I'm still waiting. So, what if my mom wanted to travel now and redeem her voucher??? The two ladies I spoke to are in serious need of training and had to explain to the second lady how to send an email to me with just replying to the one I sent her directly. Come on Mango!! How can we be treated like this if you were the only airline we've ever chosen to fly with?? My mom is 77 years old and had to cancel due to a serious health issue but is in desperate need of her voucher. I will not have her fly with Mango ever again if this doesn't get sorted out. I have sent TWICE her doctor's letter and flight ticket and STILL WAITING!! I did receive an email today, just a pity it was blank with no attachment but at least voucher was typed under subject!