Useless Guest Care

I tried booking a flight online 14/6/2015. Mango's payment section of the booking was down. I then had to call the call centre to do my booking, since then i have called Mango on about 10 occasions to query why i had to pay additional charges as their website was down and as such, why not charge the client the same fee as i would have paid if not going through their call centre.<br> The only communication i receive from their useless Guest Care (complaints) agents is that they will call me back. However this NEVER happens as i keep on calling them.<br> <br> Please have an agent contact me on ***.<br>