I have been claiming JSB for two years now. I work 3 days a week. I got a letter last week to say that my claim was closed as I had used my 312 stamps. I've worked out I have only used around 260. The social welfare have told me that I have used 312.
I think the JB week is 6 days.....You work 3 days and get paid for 3 days...so if you have been receiving it for 2 years as you say, that would equal 312 days.
52 weeks at 3 days = 156 days multiply that by 2 years = 312 days.
Then I would contact them. They may have recalculated your entitlement under the new rules in the last budget...(12 months were reduced to 9 months)...but I thought existing claims were exempt from the new rules in the Budget.