Refund lies

My main cable line was broken up the pole from mid March through June 1st at my vacation home.  When the tech came out to fix the problem he told he could see from the rust on the exposed wire that it had been broken for an extended period of time.  In other words it did not just happen. (check the service notes from the repair) Being the loyal 30 year customer that I am I continued to pay my bill ($637.90) and I am now seeking a refund for the period of time that I did not have service.  So over the past 6 weeks I have been told by at least 4 different customer service reps that a $450 refund (ticket #[Edited: "Personal Information"]) would post to my account within 24 hours of our conversation. (check the chat transcripts)  Still the refund has not posted.  I have dedicated well over 10 hours of my time to getting my money back.  If this can't resolved Xfinity you win but will lose because after 30 years I will close all 3 of my accounts and take my business else where.  Right now with all 3 accounts and mobile phone I am paying you about $850 a month.  Any help would be appreciated.