Failed to update detail and assist with giving Feedback

A creditor has confirmed via email to me that they have updated and sent through my paid up letter to Experian at the beginning of September. A paid up letter was sent and I have also sent the same detail on the 17th September to Experian to be updated. Despite numerous phone calls the details have still not been updated. Between the credit service provider and Experian someone is not doing their job; and as I have revieved confirmation from the creditor that they have sent an update I can only assuming it is Experian. My understanding is it takes 24 hours to update once they have recieved confirmation from the creditor- after a month and a half this hasn't happened. (Based on the creditors email and confirmation sent to me)

After a 26 minute call, I have still not had any joy. As a consumer I feel failed by Experian. I have sent emails as proof with email trail and no assistance for Experian. If Transunion can update their detail within 24 hours, I don't understand how this credit Bureau can't do the same.