A few years ago in North York, Daliran Electric did a quick and decent job with a light fixture re-wiring that I couldn't do-it-myself because of a junction box issue.
It doesn't necessarily say they do communication wiring, but you can call and ask, they should be able to handle it if it's one cable. Their rates weren't bottom-dollar but I don't recall them being unreasonable given they were able to call out quickly. You can ask for a quote.