Unfulfilled Promise and lies. Terrible service

In October 2017, there was a confusion leading to direct axis being paid settlement amounts twice. I've since then tried to rectify this. To the point I contacted, direct axis(via email 07/3/2018) requesting an investigation and requested a refund. Since then I called and 'a refund will be made within 24 hours and proof will be sent to me' and its clearly been an excess of 24 hrs and to refund. This is ********* as every email I sent afterwards was ignored.!!! 6 months is a long time to credit do I get interest on this? Disappointed that if the shoe was on the other foot legally I would have been taken to task however these people can get away with this.