In the JPA Cusomer Care Trifold for the EC there is an email address for official complaints, it is,
AFPAA Support
They are meant to respond to you within 10 working days .....I'm still waiting.
What scares me more are the highly complicated instructions you are getting from JPA about how to carry out of certain actions such as put in for an advance. If I find them difficult to understand the Fus Jock McSpatstrap 2 SCOTS hasn't a chance of being able to administer himself and I think the EC staff may have to attend anger management and stress reduction courses!