Gerard 22.
Do not take phone calls .
1. Anyone phoning you, should out of courtesy identify themselves , do not say who you are , ask them who is calling . If they do not say who it is but waffle on about needing date of birth just hang up .
2. If you accept a phone call it can be taken as re-enacting the debt , so do not accept calls .
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Very probable that your residue has been onward sold to a Debt Collection type company rather than a {Vulture} fund . These Debt collectors are good at letters/calls etc so do not engage ,suggest come back to AAM .
elcato,s advice is good.