Paid Voluntary NI contributions - How long is updating of the online NI records taking?

I'm in a similar situation, I paid 4 years voluntary NI back on the 15th May 2024 by bank transfer and these are still not allocated to my NI account. I did however have a notice appear on my NI records saying "There is a short delay in processing some payments. Your forecast will be updated as soon as possible" this notice then disappeared at the beginning of August and still no NI contributions allocated!!

Hi G Brett,
May I ask that you call our National Insurance Helpline on 0300 200 3500 (from the UK) or +44 191 203 7010 (from overseas) and they will be able to check your National Insurance account and make sure that we have received your payment.
Please have your payment details handy when you call them.
Thank you. 
 

I paid NI Contributions for multiple years on September 3rd 2024. I called the helpline and got confirmation over the phone that the payment was received and that my account would be updated. However, no update has appeared yet. Do i need to call again?