Try
http://192.168.100.1/_aslvl.asp
Change access level to 2
Password: W2402
Anyway, you should complain at the highest level in VM (the CEO) see
http://www.ceoemail.com/].
Alternatively call 150 and choose cancellation and argue the toss with them.
Tapping you off the neighbour is a can of worms for both of you as they'll blame you for anything that goes wrong from now on.
Can you tell us why they did that slave connexion? You'll be reducing their SNR and yours won't be optimum.