Bad service

We had a very bad experience with Mango Airlines. We were on our way to George from Johannesburg on flight JE817 when we were on time to check in at the self checkin point but failed to check in. After we failed and went to the counter they refused to assist. The issue we have is not the fact that we had to book a new flight but the way we were treated by the Mango staff. They showed no sympathy. We were treated almost as if we were homeless people begging for money. Very bad.