Have i been ripped off by my former employer?

I recently lost my job a month ago after working 3 months. Do anyone know if am entitled to holiday pay and how many weeks am i entitled to? I worked on bank holiday,public holiday and Sunday's,but i get same rate per hour. Have i been ripped off by my employer? I worked like 45 hours or more every week

You would be entitled to approx 1 week's holiday pay.
It would be 8% of your total hours worked, or 1/3 week per month employed, whichever is greater.
http://www.citizensinformation.ie/e...nd_holidays/annual_leave_public_holidays.html

For the Sundays, I don't think there is any automatic entitlement to extra pay. Some sectors (eg grocery retail) are signed up to agreements to pay extra.

The bank holidays should have gotten extra pay or leave, see here
http://www.citizensinformation.ie/e..._and_holidays/public_holidays_in_ireland.html