I need my original plan back

I need help restoring my previous Internet/mobile bundle after a temporary summer upgrade.

Before July 2026, my account had a 300 Mbps Internet plan with the 1.2 TB data allowance and a promotional price of approximately $15/month, together with one Xfinity Mobile line at the bundled $40/month rate.

Because my children were home for summer vacation, I temporarily upgraded to Unlimited Data. I now want to return to my previous arrangement.

I visited an Xfinity store today, and the representative told me that my previous promotion disappeared when I changed to Unlimited Data.

Please review my account history and see whether my previous promotion/bundle can be reinstated, or whether an equivalent existing-customer loyalty/retention offer is available.

I do NOT want to change to a new plan until I know the complete monthly price.

My desired configuration is:
300 Mbps Internet + 1.2 TB data allowance + 1 Xfinity Mobile line, at approximately my previous promotional price.

Please also confirm whether changing back would affect my Xfinity Mobile bundled discount.