How do I prevent charges on my bill due to Cox incompetence?

I have moved once since opening an account with Cox. At my previous address, I had consistent outages, and they eventually sent a technician out after speaking with me multiple times about the problem. I was told that whenever a technician is sent out, if the problem they have to fix is something I can take care of (i.e. my router isn't turned on or my coaxial cable isn't attached), and I essentially  waste their time then I will be charged for the cost of sending a technician out. If the problem is something that I cannot control or have access to (i.e. cables outside becoming exposed and subsequently damaged or circuitry doesn't support/have access to internet yet), then I will not be charged a service fee because it's Cox's jurisdiction to fix problems like that. The technician that was sent out reported back that he had to replace outside cables (Cox's jurisdiction), and I was told this was a visit I would not be charged for. Then I got charged for it and spent hours trying to convince them that the charge shouldn't be on my bill because they had to fix their own outside internet cables. This is pure incompetence because there should have been notes on my account about what the technician fixed which would result in me not being charged. Why wasn't there notes in the right place for my account to not be charged? This exact same thing just happened AGAIN after having to have another technician come out to get the internet turned on at my new address. I installed my router/modem and tried both coaxials in my home - no internet whatsoever. I called and they told me the same **: "if we send someone out and waste their time because it's just not plugged in or something you will be charged for the visit." No worries, I know this isn't a problem I can fix. Technician comes out, tells me that there has never been internet in my home and that he has to install new equipment and turn on internet access for the first time - OBVIOUSLY things that fall under Cox's jurisdiction and not mine. Lo and behold, I get charged $55 for a professional installation a month later. I spent hours on the phone AGAIN being told that the charge is valid because there are no notes on my account to indicate a technician was required to come out for me to have working internet. This is such utter and complete bullcrap. How hard is it to put the correct notes in the correct place so that you aren't screwing your customers over? It is absolutely unacceptable that you can literally do whatever you want and charge installation fees and try to make us pay them when the reason I didn't have internet was Cox's fault! Every single time I have the misfortune of having to speak with Cox or have them fix their own equipment, I get lied to and screwed over. This level of incompetence is disgusting; and then magically the phone operator finds notes indicating I'm telling the truth in "another grid." This has to be fixed...I can't be in business with a company that has no problem with saying one thing and then pretending that didn't happen and trying to blame their customers.