Wifi connects to network without my permission

[Guest EC#III]

Hello all,

 

 

I'm in a terrible spot and dont know what to do.

 

Backstory: used to live with my now ex so she had complete access to my router and laptop. When we went our seperate ways I found that my laptop connects to a network that I never set it up to. It's only visible when I'm connected to wifi. I told ATT about the situation and they assured me that nobody would be able to get in to my router even if they had the password (there is a sticker with all the routers information on the router). Months later I figured out the network was still in place. I rebooted the wifi gateway and changed the password on the router but it didnt help. Now, I found a file with all of my phone data on it even though I have not connected it to my wifi in days and i unplugged my router. I stupidly left my google nest and Phillip's Hue hub plugged in so I'm not sure if anyone could get in that way. I have no clue what to do and att is only now coming over to switch out the router. I just need help so I know that the ATT tech doesn't feed me bs. What do I look for? I cannot delete the network on my pc and there's profiles on my pc that I can't get access too. I'm on a Samsung laptop that is older running windows 8. I dont know how my phone data could have transferred to my laptop without being connected to wifi or my phone. I apologize in advance if this doesn't exactly make sense. I'm not very tech savvy and no one will help me.

 

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