Refuse to pay my refund

Royal alarm reinstated my debit on my account once I had cancelled the alarm and after agreeing to refund the money in Dec 2014 still has not paid the monies. I have made numerous phone calls and sent emails and they have given me various excuses and the \lady in charge"has a really poor attitude and cannot and will not commit to when and if they will return the money that is rightfully mine and that they have already agreed to pay."""