How can I resolve refund issues with Opayo/Sagepay gateway?

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Hi there - I use Opayo/Sagepay as my payment gateway (I am based in the UK) as their rates are far more competitive than Shopify Payments. However, the only issue I have is that if I have to refund someone Shopify will not put the correct amount in on the refund amount (they just leave it as zero) so I therefore I cannot send my customer the automated confirmation as they think I am not returning the money owed to them. Can anyone help in overcoming this issue? Many thanks