Internet upgrade offer requires "Pro Connect" charge

Former Cox/now Spectrum internet customer. Looking at my account pages and my "offers," I saw an upgraded speed offer, but it comes with a $50 "Pro Connect" charge that I cannot uncheck or avoid in my cart. When I chatted with customer service to place the order through them to avoid the fee (I use my own equipment and it's capable of the upgraded speed), they don't even reflect the offer let alone the extra charge though they specifically said there shouldn't be such a charge. I don't understand the charge. If I could check a box for "self-install," I would. Anyone else having this problem? I've chatted with 4 CSRs to no avail.