It just says £10 £10 £10 £10
Take a look at this page https://giffgaff.com/dashboard it will show what you have purchased in terms of goodybags and/or credit. Also have a look here for an itemised list of the purchases https://giffgaff.com/profile/payment-details selecting the 'My order history' option.
You are suggesting that 4 x purchases of £10 each have been made. Once you know what you actually have, you can decide what to do next.
You're welcome and glad it's sorted. Did the agent explain that it will take a few days for the refund to reach your bank account?