add disable customer function

lib/pages/contact/model/contact_model.dart

@@ -1,7 +1,7 @@
 import 'dart:async';
 
-import 'package:fcs/data/services/services.dart';
 import 'package:fcs/domain/vo/contact.dart';
+import 'package:fcs/helpers/firebase_helper.dart';
 import 'package:fcs/pages/main/model/base_model.dart';
 import 'package:logging/logging.dart';
 
@@ -10,8 +10,7 @@ class ContactModel extends BaseModel {
 
   Future<void> saveContact(Contact contact) async {
     await request("/contact", "PUT",
-        payload: contact.toMap(),
-        token: await Services.instance.authService.getToken());
+        payload: contact.toMap(), token: await getToken());
     notifyListeners();
   }
 }