@Solla-topee hi! Thanks a lot for your reply. 
 

after posting here i gave them another try and they finally found my wifi without doing anything different, just went through the normal configuration process.

But now they are back to not finding my wifi. yesterday i had to turn off electricity in my apartment for a bit so wifi went off and when i turned it all back on the cameras would not work. But all my other devices work perfectly with my wifi, including my 3rd camera (the C200, which i did not have to reconfigure after turning the wifi back on).

The LED on the 2 cameras C210 is blinking red and green and they can easily detect a bunch of other wifi networks, except mine.

It doesn't detect my hotspot wifi when configuring it from a different phone either.

  @Solla-topee 

thank you for your help and time, i appreciate it!

i have received their email, but they say to download a debug app (which doesn't work) and to send them the logs from my cam (which i don't feel comfortable with as they are indoor cameras so lots of personal info there and I cant be absolutely certain about what those logs will contain). 
i tried configuring the cameras from a different phone again with a hotspot from my usual phone and it worked. But now i need to change the network to my actual wifi network and it obviously doesn't work. I really don't understand why they will find absolutely any other network but the one that they actually need, even one from a bar across a whole boulevard with 6 lanes. I rebooted both cameras and the router a bunch of times too. 

Maybe someone else has had the same problem and found the culprit and a solution that works.