Why would you want to call them back?
Instead, consider blocking their calls.
If you buy on Amazon, you might want to google "Amazon phone blocker" to see what devices or apps Amazon has to offer
http://goo.gl/xf2L7B
Calls and leaves no message. I'm blocking them. Someone asked how to block the calls...i use true caller , i downloaded from play store....then it does show history and the ability to search that number by web search. It a way to block the number. It hangs up so your safe and know whom is calling.good luck. They seem to buy many numbers and if you call ...back they know it's you because they know who they called with that number.most of them are number is not in service etc..it's annoying because i have an important call about my mother about a heart transplant and these companies call all day today 4. Times. Come on really......just saying