Both are correct according to 'The American Heritage Dictionary of the English Language (4th ed.). Merriam-Webster’s Collegiate Dictionary (11th ed.)' and
the 't' sound should be silent or slightly audible.

commonly we don't pronounce 't'. it is silent.

its "ofen" in pronounciation...and "often" in written..hope you get clear now.

its "ofen" in pronounciation...and "often" in written..hope you get clear now.

But American use "often" as the pronounciation

its "ofen" in pronounciation...and "often" in written..hope you get clear now.
But American use "often" as the pronounciation

Yes you are right. It is pronounced differently across different regions of the world.

"t" is silent letter in 'often'