Who are mdr and why are they phoning me?
Answers:
If the message they leave is too obscure to work out what it's about, chances are, it's a SCAM.
If you have not signed up to the Telephone Preference Service, do so now.
Try 1471 to see if they have a number - is so, you can ask your phone provider to block that number - if not, then you could ask them to block all 'number withheld' calls (I expect they will charge about £1 a month to do so).
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