I'm sorry I haven't responded to your emails yet. I will respond to them as soon as possible.
Do the sentences given below mean the same thing as the sentence above? And are they all grammatically correct?
I'm sorry I haven't responded to your emails yet. I will get back to you on those (emails) as soon as possible.
I'm sorry I haven't responded to your emails yet. I will get back to you on that one as soon as possible.
I'm sorry I haven't responded to your emails yet. I will get back to you with those emails as soon as possible.
And if these sentences mean different things, what do they mean?