Kim Kardashian Vs Mexican Plastic Surgeon

Problem is ... el buen doctor never got Kim's permission, and we've learned she's unleashed her lawyers who are now trying to figure out how to threaten Mexican style -- without getting beheaded, of course.

We spoke with Doctor Ramirez and asked if he got Kim's permission ... to which he initially said, "Que?" And then he went on, "Obviously I did not speak to Kim Kardashian. I do not have her number."