A mother brought his son to the Sheikh Abdul Qadir Jilani to become a murid (follower) A few months later she returned and saw him looking under nourished. She complained that Hazrat was himself partaking the delicious dish of chicken daily whereas his poor son had been made to keep up on dry bread. Hazrat on this complaint picked up the bone of a chicken, by this bone suddenly transformed into a live cock, which crowed as if to testify that there is no ilah but Allah. Mohammad is His Prophet “and Sheikh Abdul Qadir is His Wali”. Addressing the terrified woman he commented “when your son is able to do this, then there will be no reason why he should not eat the same as I do.”
Silsalah-e-Qadriah - S. Abdul Qadir Gillani - Karamaat (Miracles)
Now you will also deny that,unaware of the fact that this incident is reported by a large no. of great scholars . When saints of Allah with the grace of God can do that , then communicating with dead in Barzakh, Kashf ul Qaboor etc are very little thing !