Who called from 3018061224

They've been calling me all day.  The number is a cell phone out of Maryland.  I answered and no one replied so I hung up.

Received two calls from this same number.  Called back and got a message saying incorrect number or code

Me too, they called me three times!!! When I call back it also says incorrect code

Got a call from this number. It was a chic with a Indian accent asking for Shavon. Told her it was not his number but mine. She said I qualify to enter sweepstakes for 25,000. Asked name, age, etc. Then asked if which creditcard i prefer, asked my address so I asked why she wanted my address and she hung up.
thats it.

have gotten 12 calls in 2 daysp