Then they shouldn't promise 'unlimited'. Why not pay as you go. If I pay monthly I expect to have the product for the month. If I pay forever I expect to have the product for forever.
It's like going to an all you can eat, eating the entire buffet yourself and then demanding they go out and find you more to satisfy your limitless hunger.
37S promised the product "forever", and provided it for 4 months - even if you didn't think "forever" actually meant until the end of time, I think it is reasonable to assume it meant more than a year.