Here's why:
* Monster Reborn is a Spell Card.
* Call of the Haunted only chains to Monster Effects.
Call of the Haunted's effect states: "When a monster's effect is activated that targets a monster you control: You can banish this card from your GY; negate the activation, and if you do, destroy that monster. Then, Special Summon 1 Level 4 or lower DARK monster from your GY."
Monster Reborn's effect is simply to Special Summon a monster from the Graveyard. It does not activate a monster effect, and therefore cannot be chained by Call of the Haunted.
In summary: Monster Reborn is a spell card, and Call of the Haunted only chains to monster effects. Therefore, Call of the Haunted cannot chain to Monster Reborn.