Changimg cat microchip id?

my cat has been my cat since late 2014. my mother decided to get an id chip in her information, with out me knowing. then when i found out i asked her if she could change it to my information. she said no. si basically my cat has been kidnapped from me under my nose. i dont live with my mother anymore, so i need to... show more my cat has been my cat since late 2014. my mother decided to get an id chip in her information, with out me knowing. then when i found out i asked her if she could change it to my information. she said no. si basically my cat has been kidnapped from me under my nose. i dont live with my mother anymore, so i need to change his chip information to my contact info. but i cant do that without her present, or without her agreement. how would i go about this??
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