G-Connect App is out to ***** money

At Cape Town airport i was waiting for my flight and installed the Mango app on my phone so that i can get WiFi voucher for my flight to Johannesburg. After installing the app it kept on failing during the billing process. I later found out that every time i clicked on the submit button it would take more money from me and at the end 5 transactions went off my credit card. On the plane these vouchers was useless and it wanted me to purchase a new voucher. I have emailed mango but no one comes back to me!!<br> <br> This system is defective and at this moment is *****ing money from me.