Who called from 3522004000

First time I ever received a call from this number.  I picked up the phone but said nothing.  I could hear many, many voices in the background saying things like "good afternoon I'm calling on behalf...thank you...good afternoon" ...lot's of boiler room talk.  I just hung up after about 1 minute.

Received a call last night about supper time.  Answering machine picked up but they did not leave a message