As I have said.. my mcb switch keeps on tripping.. tried all the ways.. removed all appliances... changed even the mcb.. any more suggestions.. its only one room of my house that is giving the problem it's a 10A mcb... need help guys.. please... its really irritating... help please...

A loose connection can cause heat, even with a 10 amp load, and cause the CB to trip.
I had one customer that had a 20, (twenty) amp load tripping a 200, Two hundred, amp MCB, all because of a loose nut bolting the breaker tab to the panel bus bar.

I was only able to find it using infrared detector.

Or the MCB is defective.

Changing a Main Breaker requires the help of a professional. And often the utility is needed as they do not allow electrician to pull the utility meter. Some do, some don't