Internet Device With Alltel

Before purchasing Internet through alltel, I spoke with the store representative and told her what I wanted to do with the service and she assured me that what I was getting was good enough. I explained to her that I was not knowledgeable of the internet service and again asked her was the internet package I was getting, enough for what I wanted in my home, she again told me it was. My bill for this month is 1500 dollars. I only purchased this serivce based on the information I was given. What can I do?