One of the Israeli tzedokos (either Vaad Horabonim or Kupat Hair) offer to have people daven 40 days by the kosel.
they also claim to have had the support of Rav Elyashiv.
In the Artscroll biography Rav Elyashiv said he knows of no Mekor for ravening at the Kosel for a period of 40 days.
Make of that what you will.
I personally throw their dishonest, OTT, manipulative literature in the trash as soon as I get it.
Rav Matisyahu Solomon was very critical of the promises some of these institutions make, taking advantage of people desperate for Yeshuos.
Also you can research how many people were taken in by pseudo Mekubolim promising Yeshuos if they greased their palms with silver. Rav Kadouri and Baba Sali never took money for their Brochos.