Do I still have a chance to get into a uni?

I applied for Uni through UCAS, I sent the application off but the college send it back saying there’s something wrong with it but they didn’t tell, me what. They told me to come and see them but I couldn’t because my cl was going on a trip and I had already paid the money, I tried to reschedule but they were not taking any new bookings because all the slots has been filled. The problem is I sent if off today, (I still have no idea what’s wrong with it), but I’m not sure if they send if off. There’s nothing wrong with my Personal statement because I had a lot of people checked, it even people on Y/A and everyone who give me feedback say it was great. If I missed the deadline do I still have a chance? , I really don’t think I have because all of my choices are for top Uni’s. what happens now? what could I do? Advice anyone?