You probably at a public site. I would get new cables, place the internet modem to a location where you can easily plug and unplug then take with you or hide.
I would first call your internet provider on the type of connection you have, get the cables at an electronics store that they use. If you can while on the phone call them unless you are on a phone line.
Can you get the locks rekeyed or changed?
"All I want is a weeks pay for a day's work" Steve Martin
