Hi, my name is hummingbird! Went over holiday limit due to illness, can I appeal the UC penalty?

hi im looking for answers as transitioned from esa support group to uc wracg and in 2023 i went away for 4 weeks and 5 days but couldnt come back earlier due to illness , now have had a cicil penalty of£50 and have been told i owe £884.06 on top totalling £934.06 , i didnt know i had to say i was going abroad as was supposed to be 4 weeks but due to perforated ear i couldnt fly back before