I'm sure that you've already tried this, but just in case, have you called Cox and offered to pay them, if they will pull the collection back? Since they sent it out so quickly, they could accurately say that the account was not due to go to collections, and therefore it was an error on their part, and that they were withdrawing the collection.
If you pay Cox, instead of the CA, they will get a bunch more money, so they should be motivated to do this.
Again, get it in writing. And I commend you for wanting to pay your debts. I'm just unhappy that we seem to have to martyr ourselves in the process.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007