I have recharged Rs 458 3GB data for 28 days through my airtel app as special offer after recharge they provide only 2GB 3G data for 28 days after that I called to customer care ask to them, they replied that plan has changed 3days before. Now come to point, they changed the plan in tariff plan but not changed in my airtel app, airtel app show old plan .so, please don't use airtel app for recharge.