I am not sure if there's a word for it, but I am almost positive that I heard a word for it. It might be a noun or it might be a verb, but there was definitely a word for it.
For example, let's take the following example:
The ___ sold me some insurance product that didn't suit my need at all, which led me to financial ruin.
The only word I can think of are telemarketer and scammer, but those two words are too general.