They are in fact a charity that is calling to ask if you have anything to donate so they can come and pick them up.  The phones are staffed by volunteers that are often new canadians and young so they can be hard to understand.  They are trying to do good, answer and if you don't want them to call you anymore, be polite and they will definitely respect your wishes and remove you from their lists.

This is not a do not call site. For the National DNCL site (Canada), go to
https://www.lnnte-dncl.gc.ca/index-eng.

dead air, when I answered

called, dead air

Ghost call from (416) 446-0063, the caller did not say a word. Well, if this is an official company, the callers hired should be trained in basics of good phone manners, especially if they come from a country where there are no telephones. Something to consider by the management (unless the management comes from the same country - which seems to be the case).