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I just wanted to let people know that I just had this happen to me as well. The number that was provided to call (800-888-4213) was incorrect. All you can do that is order a report. After calling around I finally found out that the online disputes are now handled by a third party, and I got their support number (800-493-2392). They were extremely helpful and didn't try to sell me anything. They got my password reset quickly even though I didn't remember the email or username that I had used for the account (I haven't accessed it in 5+ years).
I hope this helps someone like me.
Perhaps a blessing in disguise.
Maybe a good incentive to use the more effective direct dispute process rather than helping them to pre-sanitize your own dispute prior to their own sanitation by way of their e-OSCAR process.
Bypass them, and send your dispute directly to the furnisher of the disputed information.......