Adidas — adidas has no cotton pants

Dear Sir/Mam,
I had purchased an adidas pants from the showroom located at Splanda mall in Hurghada/Egypt, during the time of purchase they assured me that the pants made of %100Egyptian cotton and it will never be shorter, but after the first wash in a cold water became very short and looks funny, so i went back to the store and i asked to change to a bigger size or to refund my money, and they checked them selves how short it is but end of the time they refused and the attitude of the sale person (Mr. Mohamed) were very rude and aggressive and after 25 minutes he called his boss Mr. Amr and he asked me to talk to his boss over the phone and the man was really not nice , i dont know why such unprofessional people managing big brand stores, now i dont know what to do , to whom i should complaint, who is the person in charge of this company in Egypt, by the way by egypt law we have the right to refund or change within 14 days from the purchasing date , i bought on 20/2/11 and today is 4/3/11,,,,, !! i'm using the sports wear of adidas since more than 30 years, all my family and friends are doing the same, but for sure we will think many times before buying any of adidas product in Egypt
my cell number +[protected] just in case any of coustmer service wishes to help !!