Equipment Return

I recent had my gateway upgraded as my old one was dropping connection regularly.
I instructed the agent that I live in a rural area and am not close to any xfinity stores or FEDEX or UPS locations.
Requested a return label and box for my old equipment.

The new modem is nowhere near the size as the old one, I am unable to get to a drop off location and I don't want to be billed for two modems.

I cannot get a live person on the phone to ask for help.