Ask them: enasast at Hotmail dot com or then try them here
plus two three nine two two two five six one
Sao Tome was a Portuguese Colony. Kenya does not make sense
Normally you may receive these bills from Lisbon or direct from IATA in Brussels if your address in the IATA register is correct
South Africa through the AirNAV. Company is also an approved collecting agency for IATA/ICAO for all ZS registered a/c for all international nav. fees
Or just do like we do, pay them when you land there...one day, cause they will not let you go otherwise