Are there any differences in meaning between the two sentences? We hadn't left the place yet; we will be there in 10 minutes. We haven't left the place yet; we will be there in 10 minutes.
We really need to see this sentence in context to tell whether hasn't or hadn't is the right verb. Is the problem currently resolved or not?
The first one implies more of an imperfect version of the sentence, implying you hadn't asked for one in the past, while the second sentence is in present form implying that you have yet to ask for one. The first one isn't technically correct I believe, since hadn't is mostly used in a past sentence instead of a present sentence case like it would be here.
google searches for example of "hadn't had (V3 form of common verbs)" hardly show any results, but there are still few. So I assume this is just incorrect usages of this non-existing form. But then there is the "plusplusperfect" term which I have come across (for example "hadn't have happened"), which is a gramatically accepted, but mostly considered redundant form.
The backshifted version is certainly acceptable, though I'd move the position of 'yet' and replace with 'as yet'; this just sounds more natural to my (UK) ear: Carl said that he hadn’t as yet heard anything about the accident. Using the past simple Carl said that he didn’t hear anything about the accident so far. (or with 'yet', 'as yet', 'at this point' etc, possibly placed after 'didn't ...
backshifting - 'Hadn't heard' vs 'didn't hear' in a conversion of ...