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I booked a flexi ticket via booking.com and when I called on the 2 Feb 2023 to change my return flight they told me to pay in and additional amount to make the change. I paid the required amount and was then told that they were unable to make the change on their system. I was then told that I will get a refund for my return flight and to date I have not received this. I have made numerous calls, asked to speak to a manager and get told I cannot speak to a manager and I must just wait for the refund. I asked to get a call back from the manager and got a confirmation email stating that I would get a call back within 24hrs and I am still waiting for 4 days with no call back. This is absolutely pathethic service from booking.com