This company has the worse service ever

This company has the worse service ever. There was a double payment on the taxes. I have requested a refund on the 4 April. I did not even receive a confirmation of receipt. I called 14 days later and the call centre was useless. They could not assist me or transfer me to anyone who could. I called back the lady sent my documents through again and I received a confirmation email. It’s been 25 days and I have still not received my money. When I call no one can assist and there is no managers available. They are disgusting with their service