Down loading a single itunes song consuming an unbelieveable amount of data!

[steven103]

Using my 5S as a hotspot for my laptop.  Whenever I attempt to down load an itunes song, usually a 7-8 mb file, the download happens very slowly (several minutes) and by the time it's done it has consumed nearly 1G of data.  It's done this twice now.  I can't down load any more songs as I am already reaching my data limit after just two down loads.  Nearly a gig of data should cover a whole lot more down loads than just one song.  Itunes support has no answers and VZW has no answers as to why.  Anybody else experience this?