Hi Emma,
The Betfair Helpdesk is more support and queries than technical assistance. It’s not so easy to contact the technical team as presumably, they would be inundated with support requests.
I would advise using the support section of your Betfair account.
The link is here: https://support.betfair.com/app/contact_us/
The contact details for Betfair Developer Program (BDP) are below:
Forum: https://forum.developer.betfair.com/
Email: [email protected]
You may find references to your problem on those links, or manage to make contact with someone who is slightly more technical.
Hope that helps and you get your problem resolved!
Regards,
Support