You get calls about a new service or promotion, and it's the diction of the caller that makes you not wish to engage...?!
OP likely just has more self-awareness than most in being able to be honest about it.
I don't actually understand why anyone would be. Please don't waste my time trying to sell to me. If I'm in the market for your service, I'll let you know
Whatever you interrupted is far more important to them than whatever you're selling; especially if you haven't introduced enough filters in your process to ensure you're calling the right people.
We should either ban cold calling completely or introduce enough friction to the process that cold callers are incentivized to more closely filter who they call. (IE, I get cold calls trying to sell solar panels. The caller knows my address, and can see the solar panels on my roof on satellite photos. They just shouldn't bother calling me.)
It's because there's an imbalance of cost: It's cheaper to just nag me than to actually research if I've already bought the product or are interested in the product.