WIBTAH if I cut my daughter off our phone plan

My 29 year old trans child is no longer speaking to me after moving away with their fiancé a couple of weeks ago to live with family in another state. This was for all of our sakes. We were all living together and it seemed to be working out great. We share a phone plan between the three of us, along with car insurance, groceries, utilities, rent, all of that.

Shortly before they moved we had a verbal altercation where I said some things I had to apologize for, partly that I didn't deserve their help. My daughter definitely heard me say I neither needed nor wanted help from them, according to feedback I've gotten very recently. We had cleared that up and moved on, or so I thought.

A few weeks after the move, I was asking my daughter to help me with some issues that I struggle with and previously would go to them for, only this time it was long distance.

What I got back was a spew of how dare I ask when I didn't want their help, etc. I responded the best I could. I went away, came back, apologized, because regardless of what I said or how I meant it, what they heard hurt. I got no reply.

The time came to pay the phone bill. It took my monthly income to pay all of it without their share they used to put in when they lived here, which I asked for in plenty of time.

So I went to them and said, do you really want me to cut you off? Are you trying to break up with your mom? I received paragraphs of vitriol, of which I have the screenshots. I replied but it's been a couple of days and they haven't read my answer.

What should I do?