Is It Legal For My Company To Force Me To Switch My Phone Carrier?

I work for a telecommunications company in Colorado, i am on an H1b visa. My company has put a company wide policy that every full time employee must switch to their network. I currently have bundled xfinity internet plus cell phone plan which costs me 40$ discounted. If i switch my internet will go to 50 + ill play 30 for my phone bill making my total cost $80 which is almost double what i pay now. The way my VP told me this was absolutely humiliating, he essentially said dont make me repeat myself you understand? Like im his slave. Can they legally make me switch? Or should i just switch and avoid all the drama? Need advice