Pathetic Mango Airlines

There should a rating of NO Stars for Mango Airlines, I booked a flight on Mango Airlines for March 2020, departing time from Port Elizabeth airport at 17:50. Two days ago I get an SMS saying that the departing time has been moved up to 16:20????? To date I have had no response to the emails I sent as to why my flight time has been changed? I booked that specific flight because on that day I am working till 3pm. If my flight is leaving at 16:20 that doesnt give me time to get to the airport to checkin, they probably know I am going to miss the flight and I will be forced to book another flight eventhough this was not my doing. This is absolutely unacceptable. I have never ever had this happen to me , what Airline just changes your flight times without saying WHY?????? This is pathetic from MANGO.... Do NOT BOOK FLIGHTS WITH MANGO AIRLINES