Why is staff at Oyster card help line so useless?. You call them,
explain your problem/issue and they say "I will get back to you
shortly". A few days later you call back and can never speak to the
same person ("he/she is not available. I'll get him/her to call you
back").

Wait few days, and you call again ......

Also, why do they always insisting that you FAX your issue/problem to
them?. Someone should teach them how to use e-mail.