PLEASE HELP ME!

I did my master last year at UCL but eventually failed a module(dunno how but I did my best). I got a message from the course director that I can only get a postgrad certificate but not the degree. I wonder what can I do now if I do want to have my degree.
I did some research on the postgrad hand book and found the following statement under FLEXIBLE MODE OF STUDY:

Further guidance on modes of study
i) Students who were on a full-time mode of study who have failed but are
paying for additional registration/teaching may have their mode of study
amended as appropriate.
ii) Students enrolled on a flexible mode of study can be given advice by
programme organisers about the recommended period of time in which to
complete their studies.

I dunno if it works in my situation?

PS. I was in the 13-14 academic year but got a terrible car accident last Oct before the final results came out. I stayed in hospital for about 5 months and came out of it 2 weeks ago.
I wonder if it would be too late or I can still try to negotiate with the department?
Please help and it's quite urgent! Or can I appeal a remark cuz I think I did a lot better than the mark I got.