Poor service from British Airways

My flight from USA to UK was delayed by 26 hours. I made a complaint ( Reference No. ***5) and BA acknowledged the complaint and promised me a refund as per the EU legislation of 1200 Euros. This apology from them was dated 25th August 2022. I have followed up with numerous Emails but as of the 13th October I am still waiting for the refund. They are compelled by the EU legislation to refund me for change of flight details