How old is the transaction you are referring to? Vendor has up to 6 or 12 months time to get credited the amount from the bank after the day of transaction.
I would ask to the credit card company to investigate the transaction but most likely this time has been passed (6 /12 months) or the Vendor didn't check properly their book as most likely he received the payment.
Let me know,
Good morning please see belwo the copy i receieved, as a reciept of a payment made by card for hire equipment.
Carrier Rental Systems Ltd
Sunderland Enterprise Park West
VISA_VAT, Mail Order Sale
Card Number: ************5187
Issue Number: N/A
Auth code: 022830
They now are saying they have no record of this payment going through?
Just to make sure, as I am not 100% cleared if you are a system users or an administrator of your company credit card program.
If is you that paid the supplier 1000 gbp back in October with the company credit card and have seen this transactions charged to your account I would suggested, if the credit card company didn't do yet so, to forward the details to the supplier that mention that didn't receive payment, and in case the supplier should speak with their bank for missing the transaction. Or follow up the suggestion that the credit card company advised you.
You could also show, for extra proof to the supplier, the part of the statement you got from the credit card company showing the debit.
I wouldn't see after that a reason why the supplier couldn't see the payment or keep chasing it from you.