update

app/Models/Historial_cuenta.php

@@ -11,6 +11,10 @@ class Historial_cuenta extends Model
     protected $fillable = [
         'historial_id',
         'cuenta_id',
-       
     ];
+
+    public function historial()
+    {
+        return $this->belongsTo(Historiale::class, 'historial_id');
+    }
 }

app/Models/Historiale.php

@@ -24,7 +24,7 @@ class Historiale extends Model
 
     public function vendedor()
     {
-        return $this->belongsTo(User::class);
+        return $this->belongsTo(User::class , 'vendedor_id');
     }
 
     public function tarifa()

app/Models/Pendientes.php

@@ -18,10 +18,10 @@ class Pendientes extends Model
 
     public function servicio()
     {
-        return $this->hasMany(Servicio::class, 'servicio_id');
+        return $this->belongsTo(Servicio::class, 'servicio_id');
     }
     public function historial()
     {
-        return $this->hasMany(Historiale::class, 'historial_id');
+        return $this->belongsTo(Historiale::class, 'historial_id');
     }
 }