Re: Greasy
Is it not unreasonable for somebody to expect a "full delete" to be exactly that? Including from whatever contact list your telesales uses?
Maybe the telesales are using the telephone directory. Should they delete you from that too?
More likely they are buying a leads database from some other 3rd party. Practically speaking, if they are to avoid pestering you in the future, they are going to need to keep a record of you to remember to do so.