Air India — plane delay

Dear sirs,
We are flying from sydney to frankfurt and are experiencing terrible delays and request discount vouchers. Our flight number is ai 121. We are business class passengers with booking number 2rfaxx.
We have been stranded at this airport for 22 hours.
Although we have vouchers for the holiday inn hotl and access to the lounges, the cleanliness for an international airport is not acceptable.
I look forward to your arliest reply,