It's not unheard-of for universities to accept people who don't quite meet the entrance requirements for a conditional offer, but in the long run only the university can decide.
It may also be that they're still waiting on other parts of the annual admissions process to run, which would seem to be after A-level results in mid-August.
https://www.shu.ac.uk/study-here/apply/undergraduate/confirming-your-place
Best I can suggest is that you hang tight, and hope that they get back to you asap -- if you are still worried, then email them again at some point this week, but perhaps you will need to wait until the dates above to have some resolution.
For what it's worth, though, even if you need a little longer to get to the required standard, it's by no means too late. Firstly, merely trying this hard and caring this much suggests that you've got the drive you need; and secondly, people well into their 70s have sat and obtained first-time degrees -- the case I know of personally went to Open University, rather than attending anywhere full-time, but the principle still holds. It's never too late!