My patience has reached it's limit

I sold my house on the 8th of June 2017. I pay in advance, thus I was owed n refund from 9th of June to 30th of June's preemie. I was then debited for July, now I am owed from the from the 9th of June to 31st of July's preemie. I have been calling OOBA almost everyday and I never get an answer as to when the amount owed to me will be paid. The first excuse was that it takes 15 working days to process, second excuse was that no one requested the refund, third excuse was that they were having issues with a system migration. When I call them now to get information they take long to answer or just never do (Been on hold for over 25 minutes). So far from my numerous calls I have had 1 call back. If I knew OOBA would do this to me, I would have never used them.