recycled number we have the same problem...debt collection agencies, banks, credit cards, etc etc... they can't remove the number from the database as she gave it to them all my provider would do was offer me a new number. Going ex directory doesn't help as they have the number already. I believe the lady in question still gives this number out as some callers are very surprised when I say she hasn't been on the number for over a year. They also try different combinations eg asking for her by first name in the hope it is her on the line and she will be caught out.
I tell them they are through to an old peoples home now...