Mortgage paid off but Mortgage payment was taken

Jujitzu

Had a mortgage with Company A fixed until 1st September. 
Remortgaged with Company B. 
Company B paid my mortgage in full to Company A on 1st September.
Company A took my Direct Debit payment on 1st Sept at their new Standard Variable Rate which is £500 more than I was paying on their Fixed Rate and £380 more than I will be paying Company A for my new Fixed Rate.
I understand that the Direct Debit would go through and I even understand that it was taken at their new Standard Variable Rate.  What I do not understand is why I am being told I will have to wait 10-12 days working days before I get that money returned to me.
Is this correct/expected practice?

silvercar

The return will need to be manually processed, so it is bound to take a few days. 

MWT

The way that a DD is processed results in there being a period of a few days when the lender has the credit in their account but cannot be sure that it will not be recalled due to lack of funds in the borrowers account, so they have to wait for that period to elapse before they can schedule a repayment to be made.

Annoying, but it does all take a few days to get returned. 

GrumpyDil

Or even that you won't do an indemnity claim in the meantime and get refunded twice. 

JMA74

i tend to tell most of my clients to change their direct debits to mid month after the last months payment has been taken. This means all the closing transaction work is finalised before the DD is due

But if the date is not changed, then this waiting for a refund is usually what you have to do