Margery, form what I can see it looks like you paid through your bank (a financial institution). From what I'm told, the quickest way to get the overpayment back is through them, stating what I shared in the previous thread.
We can most definitely go through the reversal process on our end as well, but it may take a few weeks to get it all sorted. Whereas it typically takes approx. 5 business days through the bank, from our past experience.