$100 Proconnect Charge with no warning

I recently became a Cox customer and when I received my modem I went to set it up myself. I followed the instructions perfectly however it was not working. So, I followed the instructions which told me to call the support line. I did and the person on the phone was nice but when I described the problem they instantly told me they were just going to send someone out to get it set up. I was completely open to listening to further instructions but they told me that they were just going to send someone out because they couldn’t help me. The technician came and set it up and it turned out that the problem was out of my control and had to do with the building but they fixed it. On my most recent bill I received a $100 charge for the service of the technician. I was never told about there being a charge and I really never asked for them to send someone out they just told me they were sending someone. This to me seems like deceptive business practice so I contacted support asking if they could have it waived and they flat out just told me no and stopped responding. This just seems not right to me and I don’t understand the justification of charging me $100 for a service that they said was the only thing to do and not telling me about the charge. Does anyone know if there’s a way for me to get this charge waived? I was potentially going to switch my phone plan over to them in the future but if I have to pay this charge then I’m simply not going to do that and will end up canceling my internet service and going to a competitor so I don’t see how making me pay this makes any business sense for them.