Your lack of situational awareness is nobody's fault but your own. Here are a few of many possible factors which may have led to the scenario you described.
1) The "Check 6" may well have been sent before the Typhie got there but, due to lag, you didn't receive it until after you were shot up.
2) If you were between your countrymen and the typhie, there is a good chance the typhie was not within icon range until it was almost on you. If it wasn't within icon range and there are enemy planes within icon range of them, there is a good chance they didn't notice the dot approaching you.
3) If the friendlies were engaged, there is a good chance they did not notice the typhie approaching you at all.
4) If you had already become a nuisance on vox, there is a good chance people were already ignoring you and decided not to give you a "check 6".
The bottom line is that warnings and "check 6s" are nice to have but it is your job to know what is going on around you.
Regards,
Hammer