Did they say reapply in six months? If so, that means you are okay with them, but didn't meet the qualification cut. The comment "withdrawing their offer" is ominous. You might want to do a background check on yourself to see if there is something in your history, specifically credit history, which might not belong there (i.e. identity theft). Just like the five year old who ended up on the TSA security watch list, you might have bad credit because someone stole a credit card application and misused it.