Poor call center service for just basic change of flight details

I have been trying to change my flight details for flight booked for the 8th of November 2021 at 16h15. Initially I tried to do it on eDreams App, but failed as it was late to make such changes on the App and recieved a number to call instead. The number went through, I spoke to an assistant who said it was possible, and they would charge an extra fee of 600 ZAR to which I agreed. My call was then transferred to someone else who only listened to my story and kept me on hold. 37 minutes down the line I hung up. On the App I booked a plane ticket with the same airline for the preferred date which was the 7th of November and was successful. I then called the line to cancel the booking for the flight of the 8th altogether and get a refund - the call went through and I was told its possible and was asked to give reason for cancelations then put on hold for 27 minutes till rate - this - call automated came through. Flight changes are part of something they do, but failed to help me with, now I'd like to be refunded.