Go higher up, is your place of business one of many branches? Call or write the top peeps of the company.
Sounds like they are ignoring you on purpose, angry that you gave your resignation, who knows. Do they owe you back pay or something might be trying to avoid a pay out.
Not sure how it works in Ireland. If nothing in another day go into your work and talk face to face.
Life is a song - sing it. Life is a game - play it. Life is a challenge - meet it. Life is a dream - realize it. Life is a sacrifice - offer it. Life is love - enjoy it.