louisa254:i entered my pin twice and no i don't have the receipts for both i have one receipt ...
Trying again.... Have you got a receipt which says "Void (or cancelled)"?
Unfortunately this is a really difficult issue to deal with. You will be treated like a ping-pong ball by Tesco and Halifax.
Though I don't mean to allege it, what happened at the Tesco end is indistinguishable from cashier fraud. However I have had a similar experience with a Tesco point of sale terminal being unable to provide a "void" receipt when the transaction failed after the input of my PIN. I was shown a printout from the back-office which indicated no money was collected, and no funds were ever collected or reserved. (Come to think of it something similar has happened to me at M&S). I guess the systems are not as foolproof as the banks claim.
Another reason why it's difficult is that although your contractual relationship is with Halifax only, the payment processing is performed by a third party. This makes it difficult for your Halifax branch staff to get hold of the transaction data but without which they are in no position to judge.
I have only one piece of advice. Because the Halifax as a financial organisation must have a written complaints procedure, timebound at 8 weeks by your right to refer the complaint to the Financial Ombudsman Service, I suggest you make a formal complaint to Halifax strictly in accordance with their procedure. Though I can't guarantee that the FOS will automatically uphold your complaint I think the FOS would take a dim view if Halifax does not produce third party processor transaction data which clearly describes what happened.
Independently make a formal complaint to Tesco. Harder, and you will be ping-ponged between store and head office without the benefit of a written procedure.