Steviec73

I completed the necessary online submission to see if I would be able to submit a lower class of NI contributions as was working overseas in January and received confirmation through a 12 digit reference number. The site informs me that I should have received a response by March 1st but I have yet to. I am set up for email communication but nothing received there or my US postal address as they state will write to me. This morning I tried calling the 0191 number several times, getting the automated agent, only to be informed that unable to help and drop the call. Appreciate that it's a busy time but ultimately I am trying to get clarification on how much I need to pay to top up so I can make payment but all roads seem blocked. Any advice/insight would be appreciated.