In another FoI im keeping tabs on,
http://www.whatdotheyknow.com/request/tfl_helpline_0843_222_1234 which apparently has gone to the ICO and the ICO is not happy they seem to have released the DDI numbers for oyster, I don't know if they work or not.
2.2 Inbound Call Access Overview
FirstCall
N/A
020 72277892
CharityLine
32772
S-Enquiries
0845 330 9880
020 7227 7890
Enquiries
32770
S-Oyster
0845 3309876
020 7227 7886
Oyster
32766
S-Refunds
0845 3309881
020 7227 7891
Oyster_Refunds
32771