Cox Communications Email Scam

I recently received an email from cox referencing their updated Ultimate Plan. Presented with option 1, keeping my current tier 300mb down 30mb up at my current rate but I have to update my modem. Okay. Option 2, 500mb dowload speed 10mb at my current rate as well but i still have to upgrade modem. Okay. Clicked on cox link of approved modems and purchased one. Upon calling cox decide option one or two and to activate my new modem. The rep tells me my bill is going up $15 with my free upgrade? Its bad enough cox lost the RSN sport networks, if internet goes too im afraid my 15 years+ with cox is over. Very dissapointed in Cox Communications Marketing & Sales customer service.