Hi there, thanks for getting in touch!
If you are unable to sort this with the retailer, you can dispute the transaction with us. I have linked here our Chargeback form
which you can fill out regarding the transaction which you would like to make a claim on. Please note you cannot fill this form out until 30 days after the original transaction date.
I have also linked below a page that has everything you need to know about making a claim on a transaction. Please have a read over this before starting your claim. Hope this helps 😀
Chargebacks - Tesco Bank Community