U.S. Cellular U.S. Cellular's Hotspots FAIL Miserably Chicago Illinois

I purchased a ZTE Unite Hotspot from U.S. Cellular (via CellularExpress in Maryville, TN) on May 24, 2013. I also have cellular service from U.S. Cellular.  Since purchasing the Hotspot, I have experienced unreliable service.  Webpages take several minutes to load, and some don't load at all.  An exclamation mark/message often appears over the internet connection informing me that internet service is not available.  My service is not much better than dial-up, yet I am being charged $50/month.  I have contacted U.S. Cellular 4 times in the past 2 months.  I called in early June, and the rep. informed me that 2 towers were down with no indication of how long until service would be restored.  After more problems, I called again on 6/24/13 and spoke with Steven at 1:46pm who informed me that 1 tower was down.  I also called today (7/30/13) and spoke with Cody, who transferred me to Earnest (I believe) in tech. support.  Earnest informed me that a new device could be sent for $35 or I could return my device to a local store and wait until it was repaired.  I asked to be switched back to customer service and was disconnected after a 1 hour and 21 min. phone call.  I attempted to call back, but I gave up after being on hold for 21 minutes.

As U.S. Cellular is not fulfilling their end of the contract in providing internet service via my Hotspot, I believe they should cancel my contract without charging me the cancellation fee.  I have contacted the BBB about this matter.  A rep. from US Cellular recommended me taking my device to a service center but basically implied that my contract would not be cancelled.