Sanlam Customer service lacking significantly.

My Sanlam Broker and myself have been trying to sort out a lump sum deposit into my Retirement Annuity which I did incorrectly ( Via EFT, instead of on the Dash Board). This was done on 11-02-2025. It came to my attention in March 2025. Since then I have been jumping through every possible hoop to get it sorted out for the relevant Tax year. As this amount is not reflected on my Tax certificate, although all the documentation has been filled in, I can not submit my Tax Return or payment for 2025. I keep getting: " Your query will be sorted out in 7 or so days" Then. After requesting follow up. The same thing! This has been going on now with intense follow up since August/September 2025. I was asked for another 24 hours 6 days ago. Then another 24 hours 5 days ago. My broker followed up today. Nothing! I need to submit my tax returns. Please assist I am at my wits end. I have personally called repeatedly, given one reference after another. This is not acceptable as customer service. I do realise it was my original mistake, which is apparently a fairly common mistake. Surely, some accountant or actuary could apply a calculation or formula and correct the problem.