Poor service from VOX and ignorance from Frogfoot

I took an LTE month to month with VOX while I was waiting for fiber with Frogfoot to be live at my area. When it was live Vox arranged activation but I asked what will happen to the LTE and they confirmed it in writing that it will be autocancelled. However, after installation, VOX sent me an invoice for both services. When I wrote to them, I was called by an agent who told me there was no cancellation of the LTE and that the agent did not tell the truth. A caller said she will ask her manager and she will come back to me, however, I received an invoice again instead of her call. I paid for the fiber subscription without LTE but they blocked my service. I send them a cancellation email but they never came back to me. I have opened over five tickets with this matter but they never responded to my email. I wrote to Frogfoot but they rightfully said they are not involved with billing. However, Frogfoot says they cannot activate me on a different ISP unless I am cancelled with Vox. It is disappointing that Frogfoot is aware that VOX does not respect customers but does not make them accountable. Even on VOX youtube page, same complaints are raised but there is no response. See for yourself here: https://www.youtube.com/watch?v=dMwWWPfSFFY&t=150s