Why did Dev feel "deceived" and disappointed after hosting the three uninvited guests for a meal?

Dev felt deceived and disappointed because he later suspected that the Sanyasi and his two companions were actually Sai Baba and two others in disguise, fulfilling a promise to visit him. In his letter to Jog, detailed in Chapter 40, Dev lamented, "How is it that Baba deceived me?" He believed a "veil of Maya" had been spread, preventing him from recognizing his esteemed guest. Dev had invited Baba with love and was anticipating a profound spiritual experience, but the visit occurred in such an ordinary way that he failed to recognize its significance at the time, leaving him feeling that the promised event had passed him by unrecognized.