It's crap like that makes me not ever want to switch to Sprint, even if it had a solid coverage which it doesn't.
For a family of 5, the price will increase from $100/month to $190/month after January 31, 2019.
Yep - this is the reason I left Sprint many years ago for ATT. I got tired of having to call them every couple of months to ask them why my bill was different. It's been smooth sailing with ATT for ~10 years now... I won't be switching anytime soon.