Dla child mandatory reconsideration

Long story very short.

Dla turned down for 4 year old boy, autism, epilepsy, severe allergies (dairy, wheat and oral allergy syndrome). One reason for refusal - no evidence of epipen treatment therefore allergy not serious.

Mandatory recon. Further evidence provided, including evidence of epipen use.

Further declined. No mention of allergy or epipen but now says no evidence of assessment or treatment at sleep clinic therefore sleep problems are not unusual for age, they have had report from sleep clinic, epilepsy clinic, autism paediatric team, allergy consultant.

Is the next step tribunal or complaint regarding certain evidence being excluded? Namely sleep clinic report. Many thanks

Many thanks x