There are definitly no taxis
There are no official taxis. Every taxi is just a private car waiting for customers. Never take a "taxi" at the airport. It may bring you elsewhere and the chance of loosing everything is high. To reassure: just wait half an hour in the lobby of one of the big hotels. No one will call for a taxi, everyone will be picked up by a friend or another reliable person he/she called for. I once took a taxi (type "collectivo" together with a congolese friend in day time. No problem: you just tell the place you want to go and the taxidriver takes the best tour to serve all his clients. The price is very fine.


