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1.
Undorsement is the act of paying someone to NOT endorse you or your brand. The opposite of "endorsement"
Wow, The Situation was offered quite an undorsement by Abercrombie & Fitch
by TheCompletelySeriousNewsShow August 19, 2011
 
2.
When the brand pays a celebrity to ask them not to use their product for fear that it would tarnish the brand.

Opposite of endorsement.
The Situation received an undorsement when Abercrombie & Fitch offered him "a substantial payment" not to wear its clothes after it revealed it was "deeply concerned" that the 29-year-old "could cause significant damage" to the brand's "aspirational nature".
by Batman Potato August 22, 2011