ClassPass Unused Refund?

I recently discovered that I've been charged for 16 months of ClassPass without knowing, and have not used the service once. I'm trying my best to get a refund or at least a return of the credits for those months of unused service. They said the best they could do is refund 1 month, and after respectfully requesting more, they have gone up to 4 months. Is this normal? Has anyone gotten a refund for more than 4 months?