So Unprofessional

On Sunday 31 Jan 2021, I only learned through a 16h35 SMS meant to inform me of a delayed flight that my 19h45 flight had been changed to 16:30 then delayed to 18:00! As a result I missed my flight even though I was at the airport at about 17:50. Guest service said they couldn't let me in and it was not Mangos fault hence I will forfeit my fare as per their terms and conditions. Need I say that booking online forces you to check acknowledgement of terms and conditions, but if you click the link to view terms and conditions, only server error 404 is displayed. Also Mango allows bookings for flights knowing very well that they won't be available, like a 19h45 flights then hide behind country's curfew regulations. My booking was only on Jan 5, 2021 and curfew commenced a week before that. What kind of ******* is this?