Bad Customer/Tenant service

They treat tenants like trash. They lack a sense of urgency when it comes to customer disputes/queries. I've been requesting for my refund for the last 6 months. 4 staff members could not resolve the matter till now. It does not help even if you ask for a manager to intervene. All he does is promise to get someone to call me back in 2 minutes, no one ever calls. Weeks and weeks are just going by. I have placed notice at the residence i'm currently renting in Langenhoven park because NRE is responsible for my water and electricity bill. 6 months is kind of ridiculous for a query to stay unresolved. I also work in customer service, but this, is something else.