Tax no *** refund

I had returns with Sars which I honored and also some penalties with they deducted from my investments during payout, I changed my banking details, i did some online which was rejected and on the 2nd of February 2025, I went there personally to submit my banking details, the consultant assured me that everything is in order, I am expecting a refund from Sars since last year August, today on the 9 March 2025, I received a letter dated the 7th March 2025 that my banking details are rejected, the ones that I submitted personally, what kind of banking details are they looking for now. Let the author of the letter advise me please and who is penalizing them for keeping our monies