Morning Jackie
I went through the same thing as you. Returned the DLA80 end of Dec, after ringing for an extension of the three weeks they gave me to complete it!
I had a home medical on 17 Feb, received my result on 22 Mar. My award of HRM and HRC indefinitely stayed the same. The stress lifted immediately! My letter had 'Right Payments Programme' as the first line of DWP address. I initially thought that some evil person had phoned up about me, now I'm not so sure, I think it may just be that they contact some people to check they're receiving the right amount.
Hope you hear soon, then you can begin to relax again!