I am very disappointed

I am very disappointed. I had an issue with my account and changed my banking details because I had an issue with my current account.i was told that payment would be deducted on the 15th.its the 13th and it was deducted from the old account instead of my updated status..I am furious...is mi way staff *********** not to follow A simple agreement instruction???I trusted that it was followed up...I honestly should have canceled my cover...this has upseted my other account transactions..I trusted mi way to get my work done efficiently????