Tax-free Childcare Account

Hello, I have been locked out of my tax-free childcare account (my fault - I answered one of the questions incorrectly). When I try and log in I get an error message asking me to contact the helpline. However, none of the helpline numbers are working and I’m not sure what to do next. There’s a large sum of money in the account that I need to access in order to pay my daughter’s nursery fees so I’m keen to resolve this! Many thanks for your help, 

Name removed admin .

Hi,
You can contact our Child Benefit department by webchat via the link below.
Child Benefit: general enquiries
You can just click 'ask hmrc online'. A working contact number is also provided on this page.
Thank you.