Imposible to contact HMRC for NIN Voluntary Contributions after contacting my future pension

Dear All, I contacted my future pension one month ago and they suggested to call HMRC and pay two gaps in my forecast to have the 10 minimum qualified years required for my pension. However it has been an impossible mission to contact HMRC through different ways after a month. The phone line is always busy and most of the times I wait around 1,30 min only to be cutted off in the end. I tried though your chat adviser online but it always says that unfortunately there is not anyone available. Also, I tried to pay online though the app but it says that I should contact future pension center, something that already did. Please, could you give another way to contact you to get my 18 digits and be able to make the transfer? The only option left is ordinary mail?? An email? I would really appreciate any help as I'm really frustrated with that situation as the deadline is the 5th of April of 2025 Many thanks in advance

Hi, unfortunately I am having exactly the same with communications issues as you. With phone calls the digital format sends me around in circles the same with any of the phone numbers you are given to try,I have tried the call back form but even with this you don’t get a case number or anything and all you do is fill in your phone number and name without being able to inform HMRC what my issue is and all your told is they will get back to you within 8 weeks. I also tried with a written letter sent 2 weeks ago and not even hot anything back saying that they have received it. Sorry I can’t help but thought you should know your not alone with these problems.

Hi,
As long as you have contacted the DWP before 5 April 2025 and you have been unable to contact us to get the 18 digit reference number due to the high demand on the telephone lines you will be able to pay voluntary NICs after the deadline has passed at the rates that were applicable in the 2023 to 2024 tax year.
However I would advise to keep trying to contact the helpline, the first and last hour the helpline is open is the quietest tie to contact so between 8-9am and 5-6pm. We are currently taking measures to try and reduce the wait times on the telephone lines.
Thank you.