Being charged for flex box I was told was mine to keep

Service was canceled and then charged $120.for a flex box. When I started service the flex box was sent to me without knowledge. When I inquired with CS, I was told it was free of charge and mine to keep. Now I am being told something different and see there are others who experienced the same. I am personally on a tight budget and dealing with personal hardships which is why my service was canceled to begin with. Being charged for equipment I was told was mine to keep is adding insult to injury. I never even used it because I stream via smart tvs and have no idea where the box landed between moving. It feels scammy because I was told one thing and now another. Misinformation, misleading information, and surprise charges are not ok.