I cant be arsed to ring tbh.
After the crap I've had to deal with at HMRC's expense - particularly their "helplines" (the ones that dont have numbers of any of their offices, and even if they did - cant give them out ), the ones where you speak to one person who says one thing, and then speak to another and they say something else.
I apparently dont exist when it suits them except i've paid tax and NI almost non-stop for 12 years. Ditto with DH. In fact they took him to court (without notification) for £10,000. When we finally found out what they'd done, and got an accountant on the case - it turns out they actually owed us £1750.
Yet, through my work, I see companies that owe 2 or 3 years worth of PAYE etc that runs into hundreds of thousands and the HMRC are nowhere near as swift at chasing them.....it all sucks.