little confused on how the discounted phone payments work(Spectrum Mobile)

I recently got a Pixel 9 Pro XL because of the current deal going on: $16.66/month($599.99 total). However,when looking at my bill,it shows the original total price of $1099.99. im confused,does this get adjusted overtime? Spectrum usually divides the total price by 36months(3yrs). but if im paying the discounted price,divided by the original full price,that would mean im stuck with this phone for 6yrs. and i know that can't be right.