Sounds like you are mad, sad, hurt and angry. I get it.
But "don't cut your nose off to spite your face", as the saying goes.
The telecom provider to your family and friends should be a econimic decision, based on cost, product, service and efficacy.
Same thing for the next bullet point. If your new employer is currently using Verizon, pays a decent fee and gets good service, why take a risk of encouraging them to switch to something that may no work out as well for them. If they do and it does not work out, who loses? Them, you and your reputation.
Also, many of your friends work at Verizon. Do you really want to hurt your friends just to get back at some corporation? I wouldn't want my friends to do that to me, would you?
Don't sell the stock unless you have a better investment play. Right now Verizon is a solid stock play. It has a stellar dividend yielding almost 5%. There are not many places where you can get that now given the widows & orphan risk nature of the stock. Notice that whenever the market has a bad day or becomes fearful, Verizon has a good day in the market. That is not someting to throw away, particularly in this environment. Plus this is a business that you understand. Would you really wish to invest in something that you are less familiar with?
With regardd to Millennials, well, they are all about the lowest cost and/or cachet. In short, they are cheap and easy. Verizon is too expensive for many millennials as it is, which is why T-mobile gets so many of them. They also seems to flock to the 'in thing', which is why they go for iPhones even though Samsungs, Droids et al have more services and better, longer batteries. But when Millennials actually have to purchase them, then they tend to go low rent real fast, and get cheap phones.
Bottom line, don't spit into the wind, or you mess yourself up. Keep your stock untill you can find someting better. But if you keep that stock because it is a good investment play and chase business away, then you are just putting downward pressure on the stock, and you end up hurting yourself and your friends.
Be happy that you got out with the shirt on your back, a good name on your resume, and some decent severance.
I truly wish you the best of luck in your job search, and a happy & joyous holidays, despite the obvious.