Cold weather payment not recieved - swapped from IS to ESA IR

I know there is a sticky at the top of the page for CWP's, but my question is quite specific.

We qualified for a CWP just over two weeks ago.

Around the same time I was on IS, but we (as a couple) was swapped to ESA Support Group (income Related)

so we still (as a couple) recioeve an "income" benefit (ESA IR)

We havent yet recieved a letter to say we have qualifed for the CWP - last year they sent a letter for each of the three qualifying weeks.

Just wondered if I should be contacting them? If so, who do I contact..?