residency status while waiting for COA

hi guys

what is my residency status while waiting for the acknowledgment of my applicaion (Retention of rights as eea citizen)?
if there is a problem with the application will they send it back to me asking for more evidence or will they just revoke my residency card in which case i have to leave the country?

i basically been waiting for well over 2 months now for COA and i am starting to get a bit worried.

The UKBA will give you an opportunity to provide any supporting docs required to process your application.

Your status remains legal while the application is being processed.