Credit missing

Hi<br> <br> So i have a Woolworth's store care and unfortunately the account went in arrears (just had a baby and was down to one salary), so i paid up the arrears and setup a debit to avoid this in the future. i enquired as to how much credit i had from the consultant that had setup my debit order. Now two days later i go to the store to use the credit i was told i had available, to do some Christmas shopping only to get to the checkout to find that i don't have credit, i called financial services in store to be told that Woolworth removed my credit to downgrade my account. Now i thought that with the NCA i would have to informed or notified about changes to my account.