Consider purchasing a phone blocker.
You might want to google "Amazon phone blocker" to see what devices or apps Amazon has to offer
http://goo.gl/xf2L7B
HARRASSING PHONE CALLS 3 TIMES A DAY. I CANCELLED COMCAST A FEW YEARS AGO AND DO NOT OWE ANY MONEY. XO COMPANY IS THE SERVICE THAT IS CALLING AND THIS IS MOST INVASIVE.
They call me every morning before 8 a.m and leave no voice mail .I answered once and they said there from comcast and I owe 2,000 something .I later Called the comcast and said there was no record of such . These people are trying to scam