Contact Air Tanzania

Hi there,

I need to contact air tanzania but it is proving impossible. I accidentally booked a flight on the wrong date and emailed them straight away to asking them to change it to the correct date. They said it would be $200+, despite the booking terms saying it would be $50. I want to understand what the correct charge is.

I have tried emailing, phoning (both from UK and a friend in Tanzania), facebook but nothing. Any ideas appreciated!