hi its the payday loan company themselves, There is still a default on my account under their name

Hello. In late 2017 I was given a ccj from a short term/ payday loan company. I rolled over the loan once and it stood at just over 600, its now at 750 as a ccj When I got the loan I was quite unwell, unable to afford it and suffering from Paranoid schizophrenia, andxiety and depression, unable to work due to my illness. Just before the CCJ was in court I was unable to go to court as I was under section in hospital receiving treatment for a severe attack, I could not of known I had received a court date or have went to it to challenge it, I did however get someone later after I had visited home and found out about it to call up and explain. As I recall they said they couldn't do anything. I am just wondering if there is a way to challenge this?, as I am doing much better now and would like some credit to get my life back on track, but with a ccj this is very difficult. Thanks in advance