Air India — compensation for delayed flight

I am writing regarding flight ai 154 dated 27.11.2019 from vienna airport to indra gandhi international airport, new delhi with the scheduled arrival time of 10:20hrs.
My booking reference is hnlcq. The flight did leave on time from vienna and was to land in delhi at 10:20hrs but we were told that due to fog we could not land in delhi and our flight was diverted to amritsar. we landed in amritsar at 10:39hrs and were in the plane till 14:10hrs. we were not served any tea or coffee or given any snack to eat during this waiting period. We landed in delhi at 15:00hrs.
Me being a diabetic, had to wait for 7hrs before i could eat anything.
This flight arrived 4 hours 40 minute late at delhi international airport therefore i am seeking compensation under ec regulation 261/2004 for this delayed flight. My scheduled flight length was 5546kms, thus seeking 600euro for this delay.
I look forward to hearing from you within a week.

Regards,
Manjot