Low post count does not mean IQ, but I won't even go there. It's not worth it.
But somehow I am still willing to help you. The rom on the phone is pre-programeed with a user name and password specific to the original ESN on the phone. EVERY phone has a specific u/n to that phones ESN. Well you changed the ESN, and that does not update the pre-programmed u/n on the 6700.
Now, Verizon has your "new" ESN and is expecting that exact user name and password specific to your new ESN (from old phone). In order to get that specific u/n, you must know how to extract it from the old phone. Then transfer it to the 6700. But this is a lot work and might be better and trying to get it off the blacklist.
Please don't be a jerk. Ask nicely and patiently and someone will help
