SAS Airlines Seat Purchase Canceled Flight Chargeback

We got bumped from our original flight due to a connection cancellation and rebooked on AF. Everything worked out but we paid for upgraded seats on the original SAS flight and they were not refunded automatically. We’ve put in requests on the SAS website for a refund but it’s now been 3 weeks and aside from we are working on it updates there has been no action

Is it worth going through the chargeback route for the seat refund ? We purchased everything last December so I’m not sure if we will run out of time to even go this route