diff --git a/Controllers/LinesController.cs b/Controllers/LinesController.cs
index cd6ec1b..23a00c7 100644
--- a/Controllers/LinesController.cs
+++ b/Controllers/LinesController.cs
@@ -49,7 +49,7 @@ namespace line_gestao_api.Controllers
             var normalizedConta = NormalizeContaValue(conta);
             if (string.IsNullOrWhiteSpace(normalizedConta)) return null;
 
-            return AccountCompanies
+            return OperadoraContaResolver.GetAccountCompanies()
                 .FirstOrDefault(group => group.Contas.Any(c => NormalizeContaValue(c) == normalizedConta))
                 ?.Empresa;
         }
@@ -530,9 +530,9 @@ namespace line_gestao_api.Controllers
                         Cliente = clienteExibicao,
                         line.Usuario,
                         line.CentroDeCustos,
-                        SetorNome = line.Setor != null ? line.Setor.Nome : null,
-                        AparelhoNome = line.Aparelho != null ? line.Aparelho.Nome : null,
-                        AparelhoCor = line.Aparelho != null ? line.Aparelho.Cor : null,
+                        SetorNome = line.Setor != null ? line.Setor!.Nome : null,
+                        AparelhoNome = line.Aparelho != null ? line.Aparelho!.Nome : null,
+                        AparelhoCor = line.Aparelho != null ? line.Aparelho!.Cor : null,
                         line.PlanoContrato,
                         line.Status,
                         line.Skil,
@@ -1337,21 +1337,24 @@ namespace line_gestao_api.Controllers
         // ==========================================================
         [HttpPost("batch-status-update")]
         [Authorize(Roles = "sysadmin,gestor")]
-        public async Task<ActionResult<BatchLineStatusUpdateResultDto>> BatchStatusUpdate([FromBody] BatchLineStatusUpdateRequestDto req)
+        public async Task<ActionResult<BatchLineStatusUpdateResultDto>> BatchStatusUpdate([FromBody] BatchLineStatusUpdateRequestDto? req)
         {
-            var action = (req?.Action ?? "").Trim().ToLowerInvariant();
+            if (req is null)
+                return BadRequest(new { message = "Payload inválido para processamento em lote." });
+
+            var action = (req.Action ?? "").Trim().ToLowerInvariant();
             var isBlockAction = action is "block" or "bloquear";
             var isUnblockAction = action is "unblock" or "desbloquear";
 
             if (!isBlockAction && !isUnblockAction)
                 return BadRequest(new { message = "Ação inválida. Use 'block' ou 'unblock'." });
 
-            var blockStatus = NormalizeOptionalText(req?.BlockStatus);
+            var blockStatus = NormalizeOptionalText(req.BlockStatus);
             if (isBlockAction && string.IsNullOrWhiteSpace(blockStatus))
                 return BadRequest(new { message = "Informe o tipo de bloqueio para bloqueio em lote." });
 
-            var applyToAllFiltered = req?.ApplyToAllFiltered ?? false;
-            var ids = (req?.LineIds ?? new List<Guid>())
+            var applyToAllFiltered = req.ApplyToAllFiltered;
+            var ids = (req.LineIds ?? new List<Guid>())
                 .Where(x => x != Guid.Empty)
                 .Distinct()
                 .ToList();
@@ -1378,7 +1381,7 @@ namespace line_gestao_api.Controllers
                 baseQuery = _db.MobileLines.Where(x => ids.Contains(x.Id));
             }
 
-            var userFilter = (req?.Usuario ?? "").Trim();
+            var userFilter = (req.Usuario ?? "").Trim();
             if (!applyToAllFiltered && !string.IsNullOrWhiteSpace(userFilter))
             {
                 baseQuery = baseQuery.Where(x => EF.Functions.ILike(x.Usuario ?? "", $"%{userFilter}%"));
@@ -5353,7 +5356,7 @@ namespace line_gestao_api.Controllers
 
         private static void ApplyBlockedLineToReservaContext(MobileLine line)
         {
-            if (!ShouldAutoMoveBlockedLineToReserva(line?.Status)) return;
+            if (!ShouldAutoMoveBlockedLineToReserva(line.Status)) return;
             line.Usuario = "RESERVA";
             line.Skil = "RESERVA";
             if (string.IsNullOrWhiteSpace(line.Cliente))