Ruby Aus Jaggard-Hawkins

Im living in Australia and have just qualified for my pension. I have already contacted the overseas pension centre to confirm I can buy back sixteen years of NI contributions - the problem is I cannot get confirmation despited call the centre four weeks ago and at the moment I cannot get through die to the delays in handling incoming calls. Am I able to get clarification from HMRC on this issue - it seems the overseas centre cannot handle the volume of calls and questions and time is running out ? Any info would be really appreciated.