That lady told you a lie. Was she a notario? Don't ever pay notarios, they harm more than they help. Changing name does not make things easier by definition. The easiest is keeping the same name, always.
Next time, please research the process yourself (you can ask VJ for help) or pay a real lawyer. Paying notarios, paralegal online services is a bad idea. They don't care about your case and they lack education in the subject.