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The EX deletion will not affect what is reported on EQ or TU if the deletion was as a result of a dispute directly with the CRA (the CRA's don't report to "each other"). However, a Direct Dispute with the OC, that results in a deletion on one of the CRA's, should be reflected on all 3. That process can take as many as 45 days.
The FCRA does not place responsibility on the CRAs to report the outcome of a dispute filed with them to the other CRAs, it places the responsibility on the furnisher of the disputed information to notify the other CRAs if, as a result of a dispute filed with one CRA, they determine that their reporting was inaccurate, and delete for that reason.
They are then required to also notify all CRAs to which they have reported the information the same outcome. See FCRA 623(b)(1)(D).
It is not necessary to file separate disputes with each CRA, providing the furnisher follows through on its statutory obligation to report the results of your dispute to all CRAs.
I would begin by calling them, reminding them of their obligation under FCRA 623(b)(1)(D), and giving them a normal reporting period to do so.
I would reserve any additional disputes if you cant first resolve informally.