Breach of building contract

I had recently purchased a unit at the Mont tremblant estate in craigavon. It has been an unpleasant and uphill constant battle for us as new home owners. Victor from Galencia had entered an agreement that our home would have defects corrected by 1st of September this year. It has now been 3 months and none of the issues have been resolved and the contract signed by both parties has been disregarded and no attention paid. VICTOR does not answer phone calls nor does he reply to emails. I would highly advise against entering this property market. Finishing are falling apart and no heed from the team at Galencia.