Debit order

I messaged LegalWise and so did my bank from the 20th of July stating that my banking details have changed, i even had a lady from LegalWise confirming my banking details have changed. Today at 4:38pm i get an sms stating that my debit order has failed?????? really you have been told that i have changed my details. so i get LegalWise to call me and the lady says i cant help you the admin department leaves and 4:30... so how am i supposed to sort this out?