If you go here [careers.nielsen.com] and search that job title it does not appear to exist. They do have a warning posted about fraudulent job offers, so be sure it's really Nielsen that you're dealing with.
It has come to Nielsen’s attention that individuals misrepresenting themselves as Nielsen representatives have offered fraudulent employment opportunities. In some cases, job seekers are asked to pay a processing or work permit fee in order to secure an offer of employment. Nielsen and our external recruiting/placement partners will never request credit card information or charge candidates an up-front fee of any kind.
If you receive a fraudulent employment request, save the message and send it to your local law enforcement agency. You may also contact us.