Do you work for a cable company and that's why they are "bothering" you? If so, simply tell them that you are not able to do anything about their issues - they need to call the company and report their complaints.
Otherwise, you can "unfollow" someone on FB so that you don't see their posts on your News Feed.
I would add in the "About" section, "Please respect my free time and allow me to enjoy my friends on Facebook without work requests."
Anyone who doesn't see or disregards your request, can be told, "As you see on my profile, I can be contacted at work to help with your issues. You can also call the office. I'm currently unavailable."
Good luck!
Just tell them you want to leave work at work. If they're your friends, they'll understand and stop bothering you about it. If not, then just ignore them.
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