The Great Waldo

Like countless others, I have been following the advice NOT to make any payments to HMRC until I have spoken to the Pension Service at the Department of Work and Pensions. And like countless others, I have lost count of the number of times over the last few months that I have phoned, and not once managed to speak to anyone. If I am not told "call back later", I am usually just unceremoniously cut off. So can someone at HMRC/DWP please explain what exactly I am supposed to do? Do I just forget about the July deadline and accept the potential financial consequences in retirement, or do I have to spend all day, every day dialling and redialling the same number in the very slim chance that one day before the end of July I may get lucky?