In March, Wing says if transfer number from another company will get 100 credit; I transferred from Chatre; I waited until now, the company still does not apply the credit to me. I called many times, firstly, saying you have to use at least for 100 days; second time, saying the discount will show on July's bill. I still have not received any credit back now; the customer service also is bad to customers. I switched to mobility city for promotion. Even that, the company makes mistake charging me more about the balance and Wintab. I have to fight to make it correct! DO NOT USE WING, IT REALLY SUCKS!!