Cheated paid for a Comair aeroplane and required to fly on a budget aeroplane on boarding.

I booked and paid for a flight with British Airways (Comair) when we boarded it was a Kulula aeroplane which has no leg room. No apologies no refund? I booked Comair specifically not a budget airline. My flight details were: BA6308 Comair Ltd | Traveller | Confirmed 14 Sep 2021

09:15

Durban

14 Sep 2021

11:25

Cape Town