Agreed to 24-month contract, got 12-month contract instead!

Xfinity has attached an incorrect contract document to my account. I need help to have the correct contract document attached to my account.

After speaking with an Xfinity representative by telephone and agreeing to a 24-month contract, I was sent an email titled "Complete your recent request" that contained a URL for me to click on and load the contract agreement page.

That web page specified a 24-month contract period, and I verified this multiple times with the representative who remained on the line with me. However, the linked contract terms, which I viewed before checking that box in agreement, specified a "12-month term" contract. I asked the representative about this discrepancy and they assured me that I was agreeing to a 24-month contract.

After clicking that web page to agree to the new contract terms, I navigated to customer.xfinity.com/#/settings/account#legal-agreements-contract so that I could confirm the details of this new contract. Instead of a 24-month contract, the linked sales contract dated today is entitled "12 MONTH TERM CUSTOMER CONTRACT". But this is not the contract to which I agreed.

A separate email with subject "Thanks, here is your Xfinity order confirmation" shows:

	Xfinity Residential Monthly Charges
Gigabit	$price
Internet Gigabit | Download speeds up to 1200 Mbps; Upload speeds up to 35 Mbps
	The offer is subject to the terms of your 12-month term contract. $fee Early Termination Fee applies.
Gigabit Internet	Cancelled
Minimum Term Contract	Included
XM Discount Eligible	Included
Gigabit Internet	Included
	Equipment & Services
xFi Complete	$price
	$price/mo for 24 months, then regular rates apply

I don't want to have to cancel the incorrect contract and repeat the process, but I will do so if there's no other way to correct this error.