S.O.S Wifi routers continuously being hacked
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Hello there, my Neighbours are criminals and one of my ex staff was also criminal (eventually I get to know) and he was gathering many informing behind my back, and all were involved and are after my family, and they have hired some hackers and they daily came and stays all day and night nearby with specialised hacking equipments and routers, and they are able to hack into all of my Routers (more than 4) and even all the security cameras and smart devices, and I have tried many things, like using Black and white list(both options), increasing the firewall, using mac, ip address and service filtering, disabling upnp, using ap isolation, but still they are continuously attacking my router, using every possible way, like using UDP port scan, and dns, DHCP, and even they are also using fake access point name and my device mac addresses, and even they have managed to connect their routers to mine and my monthly bill of the connection has increased by 10 times, and I even have lost access from many of my devices, and don't how but many times they even manage to block all the signals from all the devices, even all the cellular network, and the local authority is doing nothing regarding this, please help...!!!!!!
@ArcherC8 thank you for the reply, I have already done almost all you have mentioned, and as they are my damn neighbours, they don't goona find somewhere else as in the pandemic they don't have any where to go, and they are short on finance; And can you once again please tell me all the steps that can be done except the one you already told, especially for the Routers and smart AI assistant speakers, to prevent them for hacking and even the steps to do after hacking, as sometimes even the smallest step can impact a lot, and if I have missed that...!!!(and yes it's a complicated network with many smart devices and security cameras, so can you please also tell how they hack my router through that devices, as one YI Security camera, is just near their house facing towards them, and I have seen them wandering around it with some smartphones and devices, and also how to prevent and protect it and what to do after it got hacked through it...)?!(And alos I guess they are using router and device spoofing, can please also tell about it); And the tricky part is that my ex staff who was a criminal and was involved with those people, he also referred me a local NVR security camera provider, and they both installed modified NVR and for live stream of the footage, I wirelessly gave access of my router to the router of NVR, and even used the app{IP Pro(VR Cam, EseeCloud)by wwupeilin} suggested by them which now I get to know by my phone security app that it was not behaving as usual and was sending data to a unknown location, and that also caused many issues...!!!!(this is the snapshot of the app, and it's permission) 
And here's some parts of the system log of some of my routers...(and the online wirless clients list that visible mac address is of their router which is stick to my router like it's bonded with it and is always connected no matter, I use all sorts of filtering and blocking)...(and there are two devices connected to my router with same mac address one is my tp link repeater and other is unknown)...
