Return equipment

Im trying to return my equipment since I canceled service. Two agents were unhelpful. The first said i would receive a return box in two days. He wanted me to speak on the phone with one of their agents. I told him I'm not able to speak on the phone.  They preceded to blow my phone up anyways. Two days later here I am with no return box or label. I spoke to another agent. He said the package was canceled do to a "technical issue". He demanded that I take it to their store to return it. I said no, I want a tracking number so I have proof that it arrived at xfinity. Last time I handed equipment to a person for return, the company still tried to charge me a equipment fee for not returning it. I want to ship my equipment. I understand xfinity has no desire to lift a finger for me now that I've canceled service. How the heck can I return this through ups?? I want tracking information!