Who called from 2097534102

tell me how I can stop getting unwanted calls?

209 753 4102

One way is to register with the Do Not Call website.  Google it.

If you get a call from an unwanted/unknown number, you can also Save it to a contact called Telemarketer01.  Most cell phones will allow more than one number under a contact.  When it gets filled, create Telemarketer02.

Called, I didn't pick up.

Missed the call.  Called back late at night.  No company name given in their recorded message.

Call and rang a few times.  Didn't pick up