Move-in conflict/tenant turn issue

Hi Xfinity Support, I am a new tenant and I moved into my apartment three months ago (I was using another internet provider until now). Today I tried to set up a new Xfinity service, but I received an email saying my information was linked to an existing account. I have never had Xfinity before. This is a Move-In Conflict / Tenant Turn issue. The previous tenant never disconnected their service. Can you please unlock my address, unlink my email/phone, and help me start my new order? I have my utility bills ready to prove my residency.