Sprint: Truth In Advertising?

I called Sprint because I want to add a line to my cell service for my son.  On the site it says I can add a line for $9.99 a month.  We would have to share minutes, but I barely use the minutes I have, so I think it would be fine.

I called to ask about it.  Sprint told me that my plan is not eligible, and they don't offer it (my measly plan) anymore, and I must switch to a Family Plan.  Here is the advert on the Sprint site I captured:

The advertisement does not say I need to switch plans. It says:
Adding a line to your current plan starting at $9.99 per line, per month, or switching to a family plan can help you and your loved ones save money. Our new Everything Family Plans allow you to share talk time, messaging and more. Plus, Everything Family Plans include unlimited Night and Weekend calling with nights starting at 7pm, nationwide long distance with no roaming charges, and unlimited mobile to mobile.
It's that "or" that is bugging me. I do not want to switch plans. I have a cheap plan with 450 minutes, of which I use maybe 40 a month. Adding a line for the Frustrated Son wouldn't limit my cell phone use, and it should be more than enough for both of us.

Am I crazy? Doesn't it say that I can add a line for as low as $9.99 a month? Does it say anywhere that I might have to change plans? I don't see it.  I think they need to remain faithful to their advertisement and give me another line for $9.99 on the plan I currently have.

Thoughts?  Lawyers?

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