Need to override my Blink cameras that I picked up at an auction

Picked up these cameras from an auction but found out that they were already registered to someone else I contacted blank and they asked me to find out who owned the previous camera and ask them to release and delete it from their account which isn't the case because I purchased them through goodwill and goodwill is an auction from donations and obviously if somebody donated them they were probably getting rid of them because they too had issues with getting them to work since they were still linked to someone else's account.
I'm looking for someone with insight who can open my eyes to possible override that I'm able to use these cameras otherwise I have to throw them away and my money