new neighbor now no internet connection

Neighbor just moved in next-door, and had a random cable tech over today, not Cox, to get internet installed. Fiancée told me that the internet isn't working and blinking orange light on modem. so I got her to troubleshoot and still nothing. on live chat with cox forever for them to just get me to retest everything, and I am pretty sure it is related to the neighbor getting internet today, and them messing our cable up, or unhooking it, and Cox wants to charge me $75 and go until tomorrow night without their overpriced internet. anyone else experience anything like this? I need internet for work, and cannot get by with the speed of my cellphones hotspot. Can I get in trouble for going outside and checking my connection at the road where the neighbors tech was working earlier?