debit order went through again

after last month when i received an email that my holiday premium has been fixed i was sure that some one did their job an actually put a stop to my debit orders but how wrong was i because even today the was a debit order of old mutual in my account so now i realy don't know what to do.this is causing bank charges in my account and i dont need apologies for the inconvenience the second time,i cannot go to the branch to submit my bank statement because i don't have time i have a new born to take care of so please someone need to fix this because its realy annoying and frustrating