No response from Call centre

My dad from Pretoria (90 years old) visited me in Cape Town over the festive season. He used Mango Airlines. His return was suposed to be on the 7 January 2016 but fell ill on 4 January 2016 with a mild stroke and where hospilized till 8 January 2016. We as family phoned the Mango Call centre to change the booking on 5 January 2016 but after a hour plus we where tired of listening \ Please be patient and and and and". I even went to Cape Town Airport on 6 January 2016 to sort this out but to no avail. On 7 Jan I tried the CT airport again and got the ticket cancelled but Mango do not even bother to reply on e-mails send to them for the issuing of the voucher. I received a blank mail from them - sender name:<br> [Email Removed] Jan 8<br> <br> <br> <br> <br> """