Call them 100 straight times hanging up once the call is answered 99 times in a row without saying a word. On the 100th call, tell the person answering the call that you will be call 100 times each day for 100 straight and hanging up each time.
I received two calls today from this number on my cell phone. They did not leave a voice mail so I don't know what they want. I suspect it's a scam because I receive phone like these (unknown caller) frequently. I generally do not answer my phone if I don't recognize the caller. My fix to this problem? I blocked the number on my cell phone.