Waiting for a refund 4 months later even after the Head of Finance approved my refund

Good day, I would like to share the non-existence of service from the Milpark Institution. I requested for my refund beginning of February. The finance department never bothered processing my request. I requested it to be escalated to the Head of Finance for review. He approved that my refund should be paid to me. 4 months later and counting, I am still waiting for it. I exhausted all their internal avenues to get my money and failed. I asked for the CEO's office for assistance, and they refused saying it is a finance query. That is how dysfunctional the administration of this Institution is. Knowing their standard response, they will apologise for the inconvenience and investigate even though I have written that my refund was approved by their HOF for payment. The funny part is that I told them that I will escalate it to social media if I do not receive my money, they did not even bother to respond to that. It could be retaliation from whatever is going inside in the Institution because there is no way employees could be this uncaring if they were treated properly by the employer.