Nokia / Xpress Music 5800 — My hand set Screen get Blank

I was purchase the Nokia 5800 Xpress Music Mobile on dt. 23/01/09 from
Richa Electronic Main Road Renukoot, Dist. - Sonebhadra (U.P.) Pin -
231217, on the faith of Nokia but in the short period on 20/02/09 i am
facing the problem "ie - Screen get blank during unlocking the screen" with
such set then i was reported to Richa Electronic on same date but no
serious action was taken and again same problem reported on 08/03/09 and
as per M/S - Richa electronic set handover on Dt. - 16/03/09 for sending
to Nokia Care Varanasi on dt . 17/03/09, Job No.[protected].

I want to replace my set as I am totally disappointed with this mobile and my faith on Nokia and its
customer handling system is very bad and i could not promote the nokia to
any other my friends