take down

[swallow888]

Are these sentences right?

I received a call from Mr. Oh and I decided to take down the message for you instead of forwarding the call to you as I knew you were not at your desk at that time. I hope you are fine with that. Mr. Oh said their products would be ready in one to two months time.

[bhaisahab]

I received a call from Mr. Oh and I decided to take a message for you, (instead of forwarding the call,) as I knew you were not at your desk at that time. I hope you are fine with that. Mr. Oh said their products would be ready in one to two months time.
I think you could dispense with the part in brackets as it's not really necessary.

[GoesStation]

Anglophones would write I hope you are OK with that or I hope that's OK with you, not I hope you are fine with that. "Fine" is used in affirmative replies, but usually not in questions or statements meant to evoke a response.

[Charlie Bernstein]

Are these sentences right?

Not bad! I'd say:

I received a call from Mr. Oh, and I decided to take down the message for you instead of forwarding it, because I knew you were not at your desk [Delete: at that time]. I hope you are fine with that. Mr. Oh said their products would be ready in one or two months time.

You need the first comma because it's a compound sentence. You need the second comma because you're starting a dependent clause. You also had some unneeded words, which I took out. In conversational English, it's good to be concise.

I hope that helps!

[bhaisahab]

You need the first comma because it's a compound sentence.

I hope that helps!

I disagree. I think the first comma is optional. I wouldn't use it.