We always recommend checking your Sezzle dashboard to verify the refund amount.
If you feel like the overall amount refunded wasn't correct, please reach out to the merchant directly. They will be able to explain why they issued the amount - it could be that they have a restocking fee or that they don't refund shipping costs.
If the overall amount refunded is correct, but it hasn't been posted correctly to your original payment method, please double-check the methods used for each installment. Often, one installment will be paid on one card, but the rest of the installments will be paid to a different card - so the refund will be broken up across two payment methods.