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Generally it takes a month or two to fall off of your reports. AT&T should have sent you a ltter stating the item was being removed. You may wish to forward that to TU and EX. Good luck!
What is the inaccuracy in the reported collection?
Unless the asserted/agreed inaccuracy was that the collection itself was not proper, such as no delinquent debt in fact, then deletion of an entire account or collection is not required based on an inaccuracy in some item of information under the account, such as the current balance.
It is common for a credtior or debt collector to decide to voluntarily delete their account with only one CRA, and retain their account with others. The issue of whether they are required to delete with all depends upon WHAT has been determined to be unverified.
What is the specific item of information that was inaccurate, and was your prior contact with them a formal dispute, or only an informal call?
A creditor or business can choose to excuse or cancel a delinquent debt or charges associated with the delinquency without also deleting the reporting that is was previously delinquent.
The fact that a manger excused continued obligation to pay a debt does not also mean that it was never legitimately delinquent unless there is also a specific finding that it was erroneously held to have been delinquent.
I would contact the manager who excused the debt and additionally request that they grant a good-will deletion of their reporting that the debt was, at some time in your payment history, delinquent. I would not dispute unless you assert that it was never delinquent.