Who called from 2015353639

They've called me around 18 times in the past 3 days. There is never a message and they always hang up after two rings.

Me too!   LOTS of calls over the past 3 days - no message ever left. I won't answer....

If you call the number back there is an option for a do not call list and it asks you to put your number in.

got this call from a teeth whitening company. have asked them to stop calling me but they won't.

Just another call from them - my fourth this evening.  Called the number back and got a recording for an option to be placed on a "do not call" list (i.e. "push 2 to be placed on the do not call list") so we'll see if it works...  What a pain!