Charged for a landline that I was unaware of

Yesterday, I noticed that my bill had gone up by roughly $30 per month. After checking the itemized bill, I noticed a landline service I was being charged for that I didn't know about, sign up for, nor was it ever installed. I called yesterday on 08/19/26 and was on the phone for 4 hours getting the bill straightened out, but nobody was able to give me a straight answer about me receiving a refund for a service that I never received nor wanted, but was charged for anyway. A couple of the chat agents even went as far as to try to blame me for this issue. I was finally put in touch with a supervisor who falsely told me he was opening up a ticket on my account. That ticket was never opened. So I called back today, on 08/20/26, and asked to be put in touch with a supervisor. I was able to officially get a ticket put in for the refund, but after I got off of the phone with the agent, I immediately get a notification that the ticket is closed.