No.

From Dec. 2009 'till March 2011, my MBS is 2,000. Last April, they reduced to 1,500. (without signing a new contract)

I emailed my General Manager but unfortunately he only replied "i will check".

After waiting for 1 month and hoping they will give the amount signed in my contract, I just received 1,800 for the month of May.

I'm asking them to return 2,000 because it will apply in the computation of gratuity,,, i'm 5 years in the company :( but sad, this is happening to me now.