It's possible that the direct debit payments were credited to the account even though they weren't actually claimed, but weren't debited back from the account until this month. Were the letters CR next to the amount? This would indicate a credit.
If you want me to have a look at the account to see if I can find out what's going on, PM me your account number, name and address. One of the CF team can confirm I'm an ntl associate, and I recommend you await their confirmation before sending your details to any forum member.
