Even after feeding the three uninvited guests, why did Dev remain doubtful, and what action did he take to resolve his confusion?

Despite personally serving the Sanyasi and his two companions, Dev did not recognize the event as the fulfillment of Baba's promise to visit. Chapter 40 explains that Dev's mind was clouded by 'a veil of Maya,' and he simply perceived the Sanyasi as 'some guest who has come to get a meal.' This delusion and doubt persisted after they left. Feeling disappointed that he had waited with great effort but received no profound 'experience,' Dev took action to resolve his confusion. He wrote a letter to Jog, questioning how Baba could have 'deceived' him and lamenting that the promise seemed to have been broken, leaving him completely unable to understand what had truly happened.