wrong number

noun
1.
a.
a call made to a number other than the one intended.
b.
the number or person reached through such a call.
2.
Slang.
a.
the wrong person for a particular task, role, or situation: Me cook a gourmet dinner?—You've got the wrong number!
b.
an inadequate, disagreeable, or repulsive person: She's OK, but her brother's a wrong number.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wrong number
 
n
a telephone number wrongly connected or dialled in error or the person so contacted

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
In fact, they were more surprised to see the wrong number of dolls than the
  right number, but different-looking ones.
Smart called into work with a dial phone on the sole of his shoe, and often got
  a wrong number.
If you fill out the forms incorrectly and/or send the wrong number of forms,
  they will be returned to you.
If the caller has reached a wrong number, be courteous.
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