Unlocking device

What a horrible joke this carrier is . I have been trying to get my phone unlocked for 6 days and every time I call I am told 24-48 hours and every time they issue a new ticket because previous agents supposedly didn’t even issue tickets . I am sick and tired of the way they treat customers. They keep apologizing and promising each one of them that they will resolve the issue this time . They keep telling me about email that never arrives . When I asked for a supervisor they put me on hold for 49 min and disconnected the call. I don’t know what else to do . Phone is paid off , service disconnected but I can’t use my service with a new carrier. Is there an agency I can file a complaint against xfinity??