Refund for a license disc

I app**** for my license disc renewal online and paid R672 on 09/02/2022 11:56:17 Reference QN****72-LFY480W. The application was reject, reason was that the car is registered in another region or province. I was running out of time since my disc expired on 31 January 2022 and I decided to renew my license disc in person at the Midrand Post Office and paid R672. I have been struggling to get a refund since and I have tried their social media team on 21/02/2022 16:33 and i was promised that I will get a refund within 7 days on the 22/02/2022 11:07. After 7 days, I followed up on 01/03/22 but no one responded. Then, I logged a request with on their website 17 February 2022 and received a WhatsApp message with reference MVLT*** but that was that last message I received from the Post Office. I went to the Post Office in Klerksdorp and I spoke to the manager, Norman, who was very helpful. He contacted Thoriso Montlha, who sent an email to her Manager Pamela Phiri, who until today, ignored the communication like all of them, which I guess it's their policy "not to respond" to anyone. All I need is my R672 which I paid to the online team, which means I paid double for one disc. Is that too much to ask? After all, it's my money and the only descent thing they can do is to refund me without saying anything since thy are all mute.