Unhappy with their service

We had a flight from PE to Cape Town (18:05). Somehow we got our departure times wrong, yet I figured this out half an hour before the time. My colleague were at the airport long before me, and printed his ticket, but still under the impression our flight is later, I know our mistake. Anyway I rushed to the airport, got there, got my ticket, we went through security, we got to the departure gate by 18:00 that is 5 minutes before departure. We were told to go to front desk, which we did. We explained the situation and were told there is nothing they can do. I took my phone out and showed him, it is only 18:05 now only(after being at departure gate, making our way to front desk, explaining our situation, then only it was departure time) Even asked if they couldn't have at least called us on the intercom like other airlines, we were just told "No" we don't do that! I know of other airlines that came into Wimpy upstairs looking for the people, calling people on the intercom.

So due to their unprofessional customer service(I do understand we were late,but were still there long before departure), we lost our money for the flights, accommodation,car rental, etc. Also our appointment for our Visa's! We had work in Norway, which is now a lost till further notice. All this just feel as if we good enough for our money, but they won't do a little thing, like call you on the airport intercom.