Xzone placement complaint

I have registered with www.Naukri.Com & my CV has been short listed by xzone placement.As said by them I have deposited the registration fee of rs.600/- On 14th july,2012 and they have told they will allow me to sit for interviews in different companies like hitachi,videocon,samsung,tata steel etc. With 100%job guaranteed.They have also said that the interview schedule for durgapur will be held from 5th of may,2012.When I have called them on 7th may,2012 they are saying that the interview will begin from 13th of july,2012.Thy are themselves not sure with their words.Kindly help me out with it as soon as possible.