Nokia N95 8gb / lcd not working

I had bought a Nokia N95 8gb from carrefour Deira city centre dubai on Dec, 2007 it got the problem in July 2008 as it was under the Gurantee period, I had submit for the repair, which they took 21 days and still the problem was not solved, again I submit the mobile on 23 august 2008 at cellucom care, they told that it will take 10-15 working day and till today (14/09/08) they had not repaired and telling that it has not came till today and not sure how many more days it will take. I am very upset with the service and I spent dhm 2750/- and I am suffering because of bad set of phone. I need the explanation or exchange the pcs for me immediately