50% off if prepay??

I returned an "xfinity call" to [Edited: "Personal Information"], after doing a reverse phone lookup and having it flagged as a "low spam risk". Person on the line asked me how much I'm paying for internet and then told me I am eligible for half off, if I prepay for 2 years. I asked if I could have the offer mailed or emailed to me & I was told no. I declined the offer. I can see how people could be fooled by this. Beware!