Change ticket on the phone for a total time of 1 hour 14 minutes before the call dropped just as she was giving me the price

I need to change a flight. I waited for an operator for 20 minutes. I explained the change to him. He put me on hold several times before telling me a supervisor had to deal with with. He puts me on hold for another 20 minutes then comes back and transfers me to the super visor. The super visor them give me different flights to the one agreed with the other guy. Doesn't really know what she's doing. Gets to the end just telling me the change is going to be $97.00 and before I can say ok she drops the call. 1 hour and 14 minutes on the phone.

I can't request a call back because I'm on a UK number. So frustrating.