So i went to the store and as I expected they wouldn't return the money nor did they wanted to offer me an exchange with another phone. The "only" possible way , said the store manager, was to give me half of its value ( after 3 days of usage and 15 minutes of talk time ) and that's about it.
So i kept it...and hope I will find a way to cope with it...maybe samsung fixes this lag...etc...
I;m going to upgrade it to 2.2 tonight...apply some lag fixes..who knows.. maybe it's going to work.
What have I learned from this story?
* Never buy phones from Italy again * , they have a long way to go until customer relations achieves the degree it has in the United KIngdom.
Thank you for your help. This topic can be closed now. Thx