The most irritating people

It is now 12:25 & I've already received 16 calls from them. Whenever I answer the call then it's silence on the other end. If someone does answer the call, then they ask me for my I.D. number & my mobile number that they called. Then I tell them that they just called me on that number & they want me to acknowledge a debt & when I tell them that I acknowledge nothing & then they try so many ways to get me to say it. It's irritating with all the calls & they don't listen to anything that I say & they say that they're acting on behalf of direct axis. When I tell them that I'm a 66-year-old pensioner, then they say that I can pay from my pension.