Misleading contract and no Supervisor to talk to during business hours?

Good Evening,

I’ve been a Comcast Business Customer since 2013. I’ve paid my bills on time and been loyal to Comcast. Last month, August 7 exactly 30 days ago, I called because I was thinking of closing the account due to financial reasons, I wished I did. The rep I spoke to offered to reduce the monthly fee and increased the speed. She was so good that it persuaded me to accept. Today, September 7 exactly 30 days from signing that new plan, I called to close the account for financial reasons and to start the process of closing the business. The rep that I spoke to informed me that I would be charged a 75% ETF. Reading the entire contract, no where in the contract did it state that there was a 75% ETF. It was pointed out to me today that there is a URL that I needed to copy and paste to see that hidden 75% ETF which in my case equates to $3673.69. Further more, the original rep that I spoke to never once mentioned that, she only said, the contract was to lock the price for 3 years. This is not right. I requested to speak to a supervisor and was on hold for a long time. The rep ended up giving me a phone number to call. She said she could not locate a supervisor because she works from home. I called around 3:30 and left a voicemail and still waiting. This is not the proper way to treat customers. This is not Customer Service.