Do Bank Holidays qualify for free calls on Talk Evenings & Weekends package?

[#1]

I always thought that calls made at any time of day on a Bank Holiday qualified for free calls (similar to a weekend), but after checking my recent calls I noticed that calls made on Christmas Day (Sunday) were free, but calls made on Boxing Day (Monday) and the Bank Holiday Tuesday incurred charges.
Is this correct?

[#2]

No they don't and the charges are correct

[#3]

Our telephone call processing system works on defined tariffs which have pre-set times through the week, e.g. 0700 - 1900 Monday - Friday or 0000 Saturday - 0000 Monday. There is no facility to specify anything outside of a normal week such as bank holidays I'm afraid.