I'm not sure what universe you live in as I have had Direct for more than 15 years and have paid every year. You are either the luckiest man in the world or you are bullshiting. No disrespect, but I have never heard of what you describe and Direct does not give things away for free.
Now, I have received discounts. Pretty good discounts. But never once did I get the ticket for free. And I have tried. Many many times.
When I say 'free', I mean, like someone else had said, they give me a discounted rate for the ticket then monthly credits off of my bill, which when added up equates to not only getting the Sunday Ticket for free, but getting additional money off of my bill making it cheaper than it would've been if I didn't order the ticket. Sometimes they'll throw in a few months of HBO's too.
But this year was different. A few months ago I got an e-mail saying they were giving it to me for free without having to do anything.
Now whether you want to believe I'm 'lucky' or 'bullshitting is of no consequence to me. The opinions of me from some random anonymous poster on an online message board mean absolutely nothing to me. But I'm sure you can google it and find stories of others doing the same. Doesn't just apply for DirecTV either. I get my satellite radio for mine and my wife's cars at a discounted rate also. You just have to call and negotiate.
My advice to you if you have tried and failed for 15 years is to try harder. Always be polite, never demand anything, but never accept anything less than a deal that gives it to you for free. If they won't give it to you, tell them you want to set a cancellation date for a few weeks from now. This puts the ball in their court and although it's never gone that far with me, I'd guess that someone in customer retention would reach out to you and try to offer you a better deal after a day or two. If they mention fees for early disconnection, tell them you have spoken to another service provider and they said they would reimburse you for the fees.
With so many other options available to watch sports now, DirecTV doesn't want to lose any customers, even if they're making less from them that they could. Something is better than nothing.
Just be polite. Firm, but polite.
TFK