No responce to communication

I received an IRP5 on my e-filing from Horizon Investments (old Mutual) for the financial year 2024 - however the directive nr is wrong according to Sars and they said I must request a new directive nr from them. My problem is that on the contact details available you hold forever and a day and when you eventually come through the consultant tells you to write a email. I now have a case nr (CSCCA***6) but nobody gets back to you help me solve the problem. This is urgent, as SARS withhold any refunds because of outstanding submissions. - If someone can assist it would be greatly appreciated