Skype vs my contacts

Hello,
Skype 'took over my mobile' replacing contacts - I created/set up myself on my mobile, mobile I own, data I own, data I am relying on - by contacts collated by Skype with no reliability thus rending my mobile difficult to use as
I have to check my archive b4 calling my contacts to make sure I am calling the right no.
beyond my understanding that Skype can take over my property without asking for my consent, unbelievable what Microsoft is allowed & gets away with