Refund After Switch

Halihelp

Hi there, 
I am looking for some advice, as I am getting nowhere with contacting the banks and merchant involved in this.
At the start of this year, I switched from Halifax to HSBC using the Current Account Switching Service. The switch completed in January, and everything went fine.
I have recently had a refund from Trainline back to my Halifax card, but the payment has not appeared in my new HSBC account. The refund completed over 30 days ago, and Trainline are adamant that the refund has completed. They have provided an ARN for Halifax to use to search for the refund. 
Halifax have advised that they cannot search for the payment, and that any monies that have been sent to the account should be passed over to HSBC - HSBC have advised that they have not held any payments, and I have checked all my statements to confirm that the money has not been received.
I am a bit lost as to what to do next.. everyone involved is blaming the other parties, and I am left with a lost payment of around £300. 
Is there anything else I should be doing, or can be doing, and whom should be checking for the payment? My old bank, or the current bank?
Any advice would be greatly appreciated.
Many thanks. 
Chris

digalumps

There is no point trying to deal with Halifax you are no longer a customer with with them and they won't help you

all queries should be directed to your new bank i.e. HSBC

 you just need to insist that under the terms of the current account switching service they need to help you and trace the payment

If they refuse then put a complaint to HSBC although maybe that is not the best way to start a relationship with your new bank!

born_again

Not HALIFAX again....

The payment has gone to Halifax, and the ARN relates to the payment on the Halifax card, so they should be able to find it. 
You could try asking to speak to HSBC disputes team and ask if they can see the ARN.