Robbing bastards.
I posted about this the other week, when it had just been a few days. We transferred £11.5k from our joint FD account to our joint Santander account on the 10th April. It left the FD account immediately but didn't appear in the Santander one. After the bank holiday we called both banks. Santander said they hadn't received it and couldn't help. FD were much more helpful, said they had released the money on the 13th and that we should have received it that day.
FD ran a banking trace and told us that it was definitely with Santander. After a bit of to and fro (with Santander telling us nothing) FD got back to us to say that Santander were waiting to clarify DH's nationality. DH is British and called a John Smith equivalent. Never lived abroad.
At no point during this saga have Santander contacted us at all. I have phoned them six times now and all they will say is that they can't see it on their systems (even though they've confirmed to FD that they have it 
).
I've now escalated it to a complaint but all that seems to have done is generated a text message saying they are looking into it.
All the account details are correct. Santander definitely have our money. It's now three weeks later. We are now paying interest on a credit card.
I am utterly furious, and powerless. How can this be allowed to happen?
Just a rant really but if anyone has any idea how I can get my money I'd be very grateful. I've googled and found horror stories of people losing tens of thousands for months. As soon as we have our money we'll be switching banks.