I had a similar issue. I was able to reach Experian at this number 800.236.4300 and chose the option for members. I was on hold for almost a hour before someone picked up but they had it removed within a day.
Thank you for the number. I got through to Transunion with no difficulty and spoke with someone at Experian. Experian is now sending me updates about my dispute, I'm hoping it's updated correctly. The customer service associate said 72 hours. I couldn't in touch with anyone at Equifax, I have to write a letter. Hopefully, it will all be settled soon.