******* over charging

I was charged for promotional data that I received free when I upgraded to a Samsung Galaxy s6.the data was supposed to be free but got charged also I was never told that I would loose all the data on the 22nd of October. In the results of me ruunong up my bill witth data charges .no one explains any thing in you company and always making a problem your customers problem. And when I call in I'm told that It will be logged and will get back 2 me with in 2 business days weeks goes pass and no one calls back I dnt thinks it's right for me to call in all the tym for feedback that I never get agents drop calls when asking to speak to a manager come on guys what type of customer service do you provide?