Was'nt allowed to board

Dear Sir or Madam,<br> <br> The following communication chronicles my recent experience with Mango airlines in specific with reservation number MXQJGN. I had return tickets from Cape Town to Durban for 2-4 October 2015. The Cape Leg went fine albeit a 18 minute delay. However the Durban to Cape Town return flight got messy. I arrived at the terminal 35 minutes before my flight and could not get the Self Service terminal to check me in. I then proceeded to the Service counter and was told that the gates for the flight had closed. I then argued that it was a full 20 minutes before take-off but was curtly told to purchase another ticket. <br> <br> None of their email address work and I would love to get in contact with their customer relations via email