Completely messed up my UCAS application

Right so, I inputted my application wrong (yes i know im an idiot but i go to a very small single subject college in which there is one teacher that sorts out ucas applications). we don't have a careers advisor and so are pretty much left to our own devices. ive had a nightmare submitting the application as i put my grades in wrong. i called ucas to sort it out, and i thought it was all done until i get an email from brighton uni saying i dont meet the grade requirements. i got a D for my first year btec and was predicted a DDD so i was confused by this. called ucas and they said that i had no predicted grades inputted into my application due to the change. brighton then offered me a contextual offer as i apparently was predicted MMM despite getting a D in my first year which makes absolutely no sense. I obviously applies to unis under the pretence that i was predicted a DDD and am now crapping myself that i wont even be considered for any of the unis i want to go to. UCAS said to ask my referee to email the individual unis but they are out of office until late january. I believe this is what you call absolutely cooked.

predicted a DDD so i was confused by this. called ucas and they said that i had no predicted grades inputted .... (Brighton) as i apparently was predicted MMM.
You seem to be very confused about your predicted grades - and what was actually entered by the school.
DDD, MMM or no grades at all?

Did you use the qualification amendment form?