Use the 'Restore Purchases' button to recover some lost purchases in The Sims FreePlay.
Open Settings (the "..." button), tap Info and tap 'Restore Purchases'.
Note: "Restore Purchases' will only restore packs such as clothing, pets or a Pool Cleaner. This does not include packs with consumable items such as LifePoints or Simoleon purchases. Please contact support if you require further assistance.