Help I received a letter for a esa assessment when I didn’t apply

Hi there I’m sure @poppy123456 and other members will be able to help I received a letter today for a telephone assessment with a healthcare professional it said health assessment advisory service on the top I’m guessing this is ESA it doesn’t look like it’s to do with pip I’m worried because it says I have a assessment in 2 weeks on the phone .

now when I applied for esa I was told I could not recieve it due to the fact I had not paid enough national insurance Contributions and il not going to go threw a assessment just for pension credits I didn’t fill out the form the health care questionnaire so why have they arranged at appointment for me is this connected to pip.

please help put my mind at rest 

kind regards