DISCOVERY HEALTH POOR SERVICE

I joined Discovery Medical Aid on the 01 April 2020, my first debit order was on 1st April 2020. I was only covered from 1 April 2020 onwards as per my members certificate. I am therefore paying my medical aid in advance. I was on the Classic Delta Saver plan for R 2628 p.m from 01/04/2020 - 31/03/2021 On 29 March 2021 I changed my plan to the Classic Delta Core for R 1960 with the effective date of 01 April 2021. I was thus incorrectly changed @ R 2628 for my debit order on the 1st April 2021. Even worse is that this amount overcharged did not even go to the MSA, I want to know what Discovery did with the R668 that they deducted from my account? I logged a query 12 days ago and I have not been contacted or received any update regarding the amount to be refunded. I have never claimed from discovery and it is very worrying seeing the service being received, I don't even want to know what will happen when I actually need to claim from them in the future. Maybe it is time to move all my policies somewhere else.