Early Termination Fee Scam

I activated a plan with Xfinity on June 3rd, 2024. I specifically requested the shortest plan because I would not need it for over a year. The agent on the phone said I could cancel anytime and said that she gave me the shortest plan. I canceled the plan on May 7th, 2025 and returned the equipment in store shortly after, I asked the employee to confirm that my plan was canceled and that I would not be billed any more. They said I would not be billed. I was sent an early termination fee of $143 a few months later. I used Xfinity bot who told me I signed a contract, I asked for a copy of the contract and they connected me with a live agent, I asked for a copy of the contract again and they told me they could not send it to me and that the bill would be canceled and confirmed that I would not be billed again. A month later I am billed again and this time it is past due. I went to the Xfinity store in Wheaton, IL to talk to an employee about this and explained that I did not need a contract over a year and don't remember signing a two year contract. He said that the people on the phone can be "misleading" and that he can see that I signed the contract but he could not show me the contract or send it to me but that it is in my account. I looked in my account under legal agreements and contracts and there is no two year contract listed. I checked my email for a confirmation of the plan with the contract and there is nothing. I got a call from a debt collector and contacted Xfinity through the live agent again, I asked for a copy of the contract and 3 different live agents ended the chat after I asked. I called and spoke to an employee who told me he was looking for confirmation of the plan and the contract. He could not find the confirmation and said that he would email a copy of the contract to me. I did not recieve any email even though he said he sent it twice. I then asked for access to the recording of the call from June 3rd 2024 when I set up the plan. First he said he couldn't send it to me and then he said he would connect me with security who could give me access. I explained the situation to security and they told me they only know how to do password resets. I called the comcast customer service number today and talked to two different employees who both claimed to email me the contract and I recieved no email both times. The second employee said they put in an escalation ticket in and that I would be contacted by a supervisor after they review the recording in 24-48 hours but I do not believe that I will be contacted back at this point. Now my account says I owe $388 and I do not have time to wait for a call back or for a copy of the contract to come in the mail because the amount will keep raising but I have not been shown proof of the contract after months of trying to recieve a copy. The only reason it was late in the first place is because an employee told me that the bill was canceled and that I would be billed again and I have been trying to figure this out since. No matter if the contract exists or not, I specifically requested a short contract and was told I would recieve one and was misled by the Xfinity employee over the phone and the in-store employee confirmed that. Please help me figure this out, I don't know what steps to take next.