Another reason I like the online chat is that the whole chat can be saved for future reference complete with the agents name just in case there is a future disconnect between DWP and HMRC. The agents I’ve spoken too are able to see our files and confirm that letters, payments and forms have been received. If I have not heard before then I will check with them every couple of months until I get the quote that confirms pension contributions are maxed out.I filled in a form online about topping up my contributions. A couple of months later I got a response by letter from HMRC saying, among other things, that they had sent my details to DWP. Then nothing. A month or so ago I thought I had better check so contacted DWP. They say they have never received anything from HMRC. Doesn't fill me with confidence. I hope I am now in the system/queue, but who knows when they give out false information.
Incidentally dealing with the pensions service here is a lot easier as far as telephone contact is concerned but the whole process is a lot more bureaucratic, as you'd expect I guess.