I'm getting nowhere calling

So the plan I had is no longer available. A agent called and said you can not have only internet anymore and need to sign up for something different. After settling for a plan we don't need he said they will mail us a box because I can not use my own personal modem anymore either. 2 weeks later no box came. I called and was told the order was cancelled. I'm confused now and said I never cancelled it. So the lady re did it and said I will have my box in a week. Well the week past, no box and now a bill came for 2x what I normally pay. I called and they said untill I plug in my new box the plan won't go into affect and because I have a service that is no longer available they charge me for a different service closest to the one I had. Asked for my box to be mailed, they told me I will have it in a week. Still no box. Call again and they can't see what the issue is. Only thing they can tell me is my bill and plan won't take effect untill I plug in a box that they won't send me.

I'm pretty sure I'm ready to cancel