The letter you have received today was obviously sent before you sent your reply to the original letter.
I do not think you have to do anything as you have sent your reply which they will now have received and it will be in the queue to be read.
Did you send an email response to the original letter as well as the hard copy sent by special delivery?
I do not think you have to do anything as you have sent your reply which they will now have received and it will be in the queue to be read.
Did you send an email response to the original letter as well as the hard copy sent by special delivery?