BadMethodCallException Method save does not exist

I am trying to update a record in the database and am getting "Method save does not exist" ---- code looks like:

$listingsDB  = User::where('id', '=', auth()->id())->get();

  foreach($listingsDB as $numberOfListing){
      $listings = $numberOfListing->numberOfListings;
   }

  $listings = ++$listings;

  $listingsDB->numberOfListings = $listings;
  $listingsDB->save();

Any help appreciated. I can't see what I'm doing wrongs - Thanx

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