T-Mobile locations in Fort Myers, FL

I have brought my iPhone 5S since last year, usually when open up a phone line, I get like 1 GB free internet access each month. However after I opened the new phone and still could not access to the internet! I waited and recently, I came down to the store by Fort Myers and asked about the internet. They did something and now I still could not go on internet without wifi even when it says "LTE"! Very frustrating! So I would recommend that the company should do something or I will end up with another phone company. Thank you.