Gaps along staircase wall

[a1679]

Hi, have got pieces of plaster falling out and gaps where wall adjoins staircase - annoying less than a year after building work was completed.

Any advice on products to use, filler, caulk, foam etc? I'm not sure what's best.

Many thanks!

 

[Wayners]

Fill and make good.
Run small bendy wooden bead up to cover future crack.
Never going to stop that cracking.