These are the duct cleaning, they take for ever to answer the phone, the dial system sucks probably because they are calling from India or some other place overseas, they call every week and with different numbers, I have told them over and over not to call it's no use.

They called my moms home two times.  I answered and they hung up.  I called the number back and the recording came on saying that the number is disconnected

Yes.  They had hung up after second ring.  When I tried calling back the operator voice mail said the number had been disconnected.

Yes, these people call night and day. I answered the phone and could barely hear them then they hung up. I called the number back and it has been discontinued. I suspect they may be calling from other numbers as well.

stop

Yes they are a duct cleaning telemarketing agency. I just reported them 5 minutes ago. PLEASE report them so that action can be taken against companies like this!! The website is...https://www.lnnte-dncl.gc.ca/plt-cmp-eng   Press complain about a telemarketing call and fill out the form!  If you don't register the complaint officially nothing is done!!