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Doesn't sound right. I take it you disputed the 30-day with all 3 bureaus and received confirmation of the removal from TU and EQ? Has the trade line been reported at all 3 within the 49 days? If so, you may need to contact them again in writing, providing a copy of the documentation you received saying they would remove it.
Was the removal of the derog based on your filing of a dispute,and if so, what was disputed?