Need to know my options

I went to try out an exercise class which was free. At the end of the night they told me there was an introductory fee of $99 for one month. I explained that due to my schedule it may be difficult to do the classes. Anyway, I end up paying. The next day after looking at the schedule for the week of the classes I realize that it would not be profitable so I called them to say I wanted a refund. They said they don't do refunds.

No one explained to me that there were no refunds. I also got an email of my contract which has my digital name but someone's signature (presuming whoever did it). In other words I did not sign any document. This location is independently operated but it is a nationwide franchise.

What are my options instead of Twitter