Naaptol Online Shopping — Rott

I purchased roti maker from naaptol seeing their advt on tv .My roti maker has several problems and is not working as shown in advt. I have called them several time & asked them to make the demo. However no one turned out & now today i received a call informing that i am winner of prize in their lucky winner draw & i shall receive some prize from them & i have to pay rs 3000 on receipt of prize against packing, delivery charge. On enquiry i found it seems to fake call. But i donot know how caller received my contact details & naaptol order number.