British Airways Comair disgusting service!!!!!

I booked an air ticket for my son to travel on the 27th December. I received an email from British Airways to say the flight had been cancelled and that I could either cancel the flight booking or move it. Because of transfers and him having to fly on the 27th I had to cancel the flight and requested a refund, this is now where the problem starts. I then received this email from them on the 24/1/2022:

Booking ***

Dear Customer,

We’re so sorry you haven’t yet received your refund from us.

A system issue affecting a small number of customers has been found that was causing a delay in processing your refund. However, we are aware of it, we have now corrected the issue and are using extra resource to prioritise your booking to ensure you are refunded as quickly as possible.

We understand this is not the service you would expect from us and we thank you for your patience while we process your refund. We will be in touch again once it has been processed to confirm the money has been returned to you.

British Airways I have now emailed, phoned, sent them messages via Facebook and still no response!! COME ON BRITISH AIRWAYS, HOW LONG DOES IT TAKE TO GET A REFUND!!!!!