Unlinking contacts in blackberry z10

Hi,
My contacts on Z10 are really getting crazy: not only are they replicating themselves many times, so that I have nearly 6000 contacts whereas in true it may be only 2000. But also they are linking each other in a complete absurd way. And when I go and try to unlink them, no matter if I click on the "unlink" sign, even after restarting the phone, they are still linked (sometime more than 100 contacts are merged together) so now, in many opportunities, I don't know who is really calling me...I understand that it may be a problem with linking with gmail or with Linkedin. So how can I unlink without loosing them?
Please HELP !

Have you tried a security wipe, then when setting up your accts sync contacts , then get the app back up pro from BBW and save to your sd card or cloud then go back into your email acct and unsysnc contacts, use the app from then on out, it's all I use.