'Come mai mi rispondi?' is an Italian equivalent of 'How come you are not answering me?' Italian language speakers may choose not to use subject pronouns other than for clarification or emphasis. The second person singular pronoun 'tu' doesn't have to be used in this instance. The subject is clear from the verb form, 'rispondi'.
Is she replying back
replying to clear this
The phrase 'am no replying back to you' is not a sentence and is not correct grammar.
Thank you for your time in replying to the insurance
Thank you for replying = Faafetai lava mo le tali.
A bid in bridge replying to a partner's bid or double is a "response".
If you are smart, you won't. Otherwise, she may just stop replying at all.
By replying.
replying
not to be stupid
There is no way you can make people quit replying to your comments. Once they are posted, the comments can only be removed by moderators.
Have we replied to the client on the issue? The client haven't yet replied to our letter.