Olympics and Paralympics sponsor Visa has run into criticism for failing to provide on-site ATMs that are suitably equipped for blind and partially sighted people.
As part of its $100 million contract, Visa insisted on replacing 27 ATMs at various Olympic and Paralympic sites with just eight of its own machines.
According to the BBC, the Royal National Institute of Blind People (RNIB) has been working with the card giant and Games organising committee (Locog) for three years to make sure some ATMs have audio technology to assist people with sight defects.
Concerned about progress, the RNIB first threatened Visa with legal action in July in a bid to ensure machines had audio assistance.
Visa promised to upgrade two ATMs but failed to follow through - six have Braille and tactile keypads and even sockets for headphones but the necessary software has not been installed.
The RNIB's Steve Winyard told the BBC he was "extremely disappointed" and the charity reserves the right to take action if it receives reports of users struggling with the machines.
In a statement, Visa Europe says: "Audio functionality is not currently a standard feature of ATMs available to end users in the UK, and when contacted by the RNIB in June 2012 Visa undertook extensive investigations into whether the scope of ATM provision at the Olympic and Paralympic Games could be changed.
"The short timeframe meant this was not feasible, however all ATMs are equipped with Braille and tactile keypads, and are at accessible height for wheelchair users."
Games sponsor Visa in row with charity - BBC