Billing Dispute / "Customer Service"

First issue I had been being billed for a video doorbell that I did not have in my possession that I had returned the previous year when I received it due to living in an apartment and not having wires to connect it so I returned it to a Comcast store like I was instructed by the agent. Only to find out an entire year later that I had been being billed for it the entire year! I called spoke to a customer service agent & was under the impression that the issue had been resolved and the camera had been taken off my account and I was given a $85 credit. Well a month after that I got a notification from my bank that Comcast charge my bank account $94, I was confused because I was under the impression that I had a $85 credit and even more confused because my monthly bill was only $33.54 since the beginning of me starting with Comcast so not sure what that happened. So I called spoke to another agent and after being on the phone for about 3 hours he finally understood what I was trying to say and why that was a fraudulent transaction and I did not authorize it. So he told me okay, we're going to credit your account the $94 and all you need to do is contact your bank and put a stop payment on the $94 transaction so I did. Fast Forward another month to now I look at my bill and it is for $65 again my bill is normally $33.54 that's how much it's been for almost 2 years now until I brought up the issue of being billed for that video doorbell and I was given the $60 credit so I called and spoke to the rudest if you want to call it supervisor that I've ever spoken to and that's with any company! He proceeded to tell me that the extra $30 charge was a return check fee stemming from the $94 fraudulent charge that they had charged my bank account and told me to put a stop charge on it so that's what I did. the guy was so rude he all he did was cut me off and speak over me so I eventually hung up because I did not want to lose my temper and the conversation was going nowhere because he wouldn't let me speak and he just kept repeating himself over and over and over and over and over about the return check fee and I kept telling him, I understand it's a return check fee but it wouldn't have been a return check fee if you wouldn't have charged my bank account fraudulently in the first place! So here we are now the next month I get a bill for $65! I don't understand why they refuse to acknowledge that there wouldn't have ever been a return check fee if Xfinity would have never charged my bank fraudulently in the first place?! now I'm being threatened to have my services turned off if I do not pay the return check fee and I can't speak to anybody that listens or understands or has any sense about them financially or accounting wise [Edited: "Inflammatory"].